Radar is an object-detection system which uses electromagnetic waves—specifically radio waves—to determine the range, altitude, direction, or speed of both moving and fixed objects such as aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. The radar dish, or antenna, transmits pulses of radio waves or microwaves which bounce off any object in their path. The object returns a tiny part of the wave's energy to a dish or antenna which is usually located at the same site as the transmitter.
The military applications of radar were developed in secret in nations across the world during World War II. The term ''RADAR'' was coined in 1940 by the U.S. Navy as an acronym for ''radio detection and ranging''. The term ''radar'' has since entered the English and other languages as the common noun ''radar'', losing all capitalization. In the United Kingdom, the technology was initially called RDF (''range and direction finding''), using the same initials used for radio direction finding to conceal its ranging capability.
The modern uses of radar are highly diverse, including air traffic control, radar astronomy, air-defense systems, antimissile systems; nautical radars to locate landmarks and other ships; aircraft anticollision systems; ocean-surveillance systems, outer-space surveillance and rendezvous systems; meteorological precipitation monitoring; altimetry and flight-control systems; guided-missile target-locating systems; and ground-penetrating radar for geological observations. High tech radar systems are associated with digital signal processing and are capable of extracting objects from very high noise levels.
Other systems similar to radar have been used in other parts of the electromagnetic spectrum. One example is "lidar", which uses visible light from lasers rather than radio waves.
Several inventors, scientists, and engineers contributed to the development of radar.
As early as 1886, Heinrich Hertz showed that radio waves could be reflected from solid objects. In 1895 Alexander Popov, a physics instructor at the Imperial Russian Navy school in Kronstadt, developed an apparatus using a coherer tube for detecting distant lightning strikes. The next year, he added a spark-gap transmitter. During 1897, while testing this in communicating between two ships in the Baltic Sea, he took note of an interference beat caused by the passage of a third vessel. In his report, Popov wrote that this phenomenon might be used for detecting objects, but he did nothing more with this observation.
The German Christian Huelsmeyer was the first to use radio waves to detect "the presence of distant metallic objects". In 1904 he demonstrated the feasibility of detecting a ship in dense fog, but not its distance. He received Reichspatent Nr. 165546 for his detection device in April 1904, and later patent 169154 for a related amendment for also determining the distance to the ship. He also received a British patent on September 23, 1904 for the first full Radar application, which he called ''telemobiloscope''.
In August 1917 Nikola Tesla outlined a concept for primitive radar units. He stated, "[...] ''by their'' [standing electromagnetic waves] ''use we may produce at will, from a sending station, an electrical effect in any particular region of the globe; ''[with which]'' we may determine the relative position or course of a moving object, such as a vessel at sea, the distance traversed by the same, or its speed''."
In 1922 A. Hoyt Taylor and Leo C. Young, researchers working with the U.S. Navy, discovered that when radio waves were broadcast at 60 MHz it was possible to determine the range and bearing of nearby ships in the Potomac River. Despite Taylor's suggestion that this method could be used in darkness and low visibility, the Navy did not immediately continue the work. Serious investigation began eight years later after the discovery that radar could be used to track airplanes.
Before the Second World War, researchers in France, Germany, Italy, Japan, the Netherlands, the Soviet Union, the United Kingdom, and the United States, independently and in great secrecy, developed technologies that led to the modern version of radar. Australia, Canada, New Zealand, and South Africa followed prewar Great Britain, and Hungary had similar developments during the war.
In 1934 the Frenchman Émile Girardeau stated he was building an obstacle-locating radio apparatus "conceived according to the principles stated by Tesla" and obtained a patent (French Patent n° 788795 in 1934) for a working system. A part of which was installed on the Normandie liner in 1935.
During the same year, the Soviet military engineer P.K.Oschepkov, in collaboration with Leningrad Electrophysical Institute, produced an experimental apparatus, RAPID, capable of detecting an aircraft within 3 km of a receiver. The French and Soviet systems, however, had continuous-wave operation and could not give the full performance that was ultimately at the center of modern radar.
Full radar evolved as a pulsed system, and the first such elementary apparatus was demonstrated in December 1934 by the American Robert M. Page, working at the Naval Research Laboratory. The year after the US Army successfully tested a primitive surface to surface radar to aim coastal battery search lights at night. This was followed by a pulsed system demonstrated in May 1935 by Rudolf Kühnhold and the firm GEMA in Germany and then one in June 1935 by an Air Ministry team led by Robert A. Watson Watt in Great Britain. Later, in 1943, Page greatly improved radar with the monopulse technique that was then used for many years in most radar applications.
The British were the first to fully exploit radar as a defence against aircraft attack. This was spurred on by fears that the Germans were developing death rays. The Air Ministry asked British scientists in 1934 to investigate the possibility of propagating electromagnetic energy and the likely effect. Following a study, they concluded that a death ray was impractical but that detection of aircraft appeared feasible. Robert Watson Watt's team demonstrated to his superiors the capabilities of a working prototype and then patented the device (British Patent GB593017). It served as the basis for the Chain Home network of radars to defend Great Britain. In April 1940, ''Popular Science'' showed an example of a radar unit using the Watson-Watt patent in an article on air defence, but not knowing that the U.S. Army and U.S. Navy were working on radars with the same principle, stated under the illustration, "This is not U.S. Army equipment." Also, in late 1941 ''Popular Mechanics'' had an article in which a US scientist conjured what he believed the British early warning system on the English east coast most likely looked like and was very close to what it actually was and how it worked in principle.
The war precipitated research to find better resolution, more portability, and more features for radar, including complementary navigation systems like Oboe used by the RAF's Pathfinder. The postwar years have seen the use of radar in fields as diverse as air traffic control, weather monitoring, astrometry, and road speed control.
The information provided by radar includes the bearing and range (and therefore position) of the object from the radar scanner. It is thus used in many different fields where the need for such positioning is crucial. The first use of radar was for military purposes: to locate air, ground and sea targets. This evolved in the civilian field into applications for aircraft, ships, and roads.
In aviation, aircraft are equipped with radar devices that warn of obstacles in or approaching their path and give accurate altitude readings. The first commercial device fitted to aircraft was a 1938 Bell Lab unit on some United Air Lines aircraft. They can land in fog at airports equipped with radar-assisted ground-controlled approach (GCA) systems, in which the plane's flight is observed on radar screens while operators radio landing directions to the pilot.
Marine radars are used to measure the bearing and distance of ships to prevent collision with other ships, to navigate and to fix their position at sea when within range of shore or other fixed references such as islands, buoys, and lightships. In port or in harbour, vessel traffic service radar systems are used to monitor and regulate ship movements in busy waters. Police forces use radar guns to monitor vehicle speeds on the roads.
Meteorologists use radar to monitor precipitation. It has become the primary tool for short-term weather forecasting and to watch for severe weather such as thunderstorms, tornadoes, winter storms, precipitation types, etc. Geologists use specialised ground-penetrating radars to map the composition of the Earth's crust.
Radar receivers are usually, but not always, in the same location as the transmitter. Although the reflected radar signals captured by the receiving antenna are usually very weak, these signals can be strengthened by the electronic amplifiers that all radar sets contain. More sophisticated methods of signal processing are also nearly always used in order to recover useful radar signals.
The weak absorption of radio waves by the medium through which it passes is what enables radar sets to detect objects at relatively-long ranges—ranges at which other electromagnetic wavelengths, such as visible light, infrared light, and ultraviolet light, are too strongly attenuated. Such things as fog, clouds, rain, falling snow, and sleet that block visible light are usually transparent to radio waves. Certain, specific radio frequencies that are absorbed or scattered by water vapor, raindrops, or atmospheric gases (especially oxygen) are avoided in designing radars except when detection of these is intended.
Finally, radar relies on its own transmissions, rather than light from the Sun or the Moon, or from electromagnetic waves emitted by the objects themselves, such as infrared wavelengths (heat). This process of directing artificial radio waves towards objects is called ''illumination'', regardless of the fact that radio waves are completely invisible to the human eye or cameras.
Electromagnetic waves reflect (scatter) from any large change in the dielectric constant or diamagnetic constants. This means that a solid object in air or a vacuum, or other significant change in atomic density between the object and what is surrounding it, will usually scatter radar (radio) waves. This is particularly true for electrically conductive materials, such as metal and carbon fiber, making radar particularly well suited to the detection of aircraft and ships. Radar absorbing material, containing resistive and sometimes magnetic substances, is used on military vehicles to reduce radar reflection. This is the radio equivalent of painting something a dark color so that it cannot be seen through normal means (see stealth technology).
Radar waves scatter in a variety of ways depending on the size (wavelength) of the radio wave and the shape of the target. If the wavelength is much shorter than the target's size, the wave will bounce off in a way similar to the way light is reflected by a mirror. If the wavelength is much longer than the size of the target, the target may not be visible due to poor reflection. Low Frequency radar technology is dependent on resonances for detection, but not identification, of targets. This is described by Rayleigh scattering, an effect that creates the Earth's blue sky and red sunsets. When the two length scales are comparable, there may be resonances. Early radars used very long wavelengths that were larger than the targets and received a vague signal, whereas some modern systems use shorter wavelengths (a few centimeters or shorter) that can image objects as small as a loaf of bread.
Short radio waves reflect from curves and corners, in a way similar to glint from a rounded piece of glass. The most reflective targets for short wavelengths have 90° angles between the reflective surfaces. A structure consisting of three flat surfaces meeting at a single corner, like the corner on a box, will always reflect waves entering its opening directly back at the source. These so-called corner reflectors are commonly used as radar reflectors to make otherwise difficult-to-detect objects easier to detect, and are often found on boats in order to improve their detection in a rescue situation and to reduce collisions.
For similar reasons, objects attempting to avoid detection will angle their surfaces in a way to eliminate inside corners and avoid surfaces and edges perpendicular to likely detection directions, which leads to "odd" looking stealth aircraft. These precautions do not completely eliminate reflection because of diffraction, especially at longer wavelengths. Half wavelength long wires or strips of conducting material, such as chaff, are very reflective but do not direct the scattered energy back toward the source. The extent to which an object reflects or scatters radio waves is called its radar cross section.
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However, the change in phase of the return signal is often used instead of the change in frequency. It is to be noted that only the radial component of the speed is available. Hence when a target is moving at right angle to the radar beam, it has no velocity while one parallel to it has maximum recorded speed even if both might have the same real absolute motion.
The maximum range of a conventional radar can either be limited by a number of factors: #Line of sight, which depends on height above ground. #The maximum non-ambiguous range (MUR) which is determined by the Pulse repetition frequency (PRF). Simply put, MUR is the distance the pulse could travel and return before the next pulse is emitted. #Radar sensitivity and power of the return signal as computed in the radar equation. This includes factors such as environmentals and the size (or radar cross section) of the target.
Noise is also generated by external sources, most importantly the natural thermal radiation of the background scene surrounding the target of interest. In modern radar systems, due to the high performance of their receivers, the internal noise is typically about equal to or lower than the external scene noise. An exception is if the radar is aimed upwards at clear sky, where the scene is so "cold" that it generates very little thermal noise.
There will be also flicker noise due to electrons transit, but depending on 1/f, will be much lower than thermal noise when the frequency is high. Hence, in pulse radar, the system will be always heterodyne. See intermediate frequency.
In less technical terms, SNR compares the level of a desired signal (such as targets) to the level of background noise. The higher a system's SNR, the better it is in isolating actual targets from the surrounding noise signals.
Some clutter may also be caused by a long radar waveguide between the radar transceiver and the antenna. In a typical plan position indicator (PPI) radar with a rotating antenna, this will usually be seen as a "sun" or "sunburst" in the centre of the display as the receiver responds to echoes from dust particles and misguided RF in the waveguide. Adjusting the timing between when the transmitter sends a pulse and when the receiver stage is enabled will generally reduce the sunburst without affecting the accuracy of the range, since most sunburst is caused by a diffused transmit pulse reflected before it leaves the antenna.
While some clutter sources may be undesirable for some radar applications (such as storm clouds for air-defence radars), they may be desirable for others (meteorological radars in this example). Clutter is considered a passive interference source, since it only appears in response to radar signals sent by the radar.
There are several methods of detecting and neutralizing clutter. Many of these methods rely on the fact that clutter tends to appear static between radar scans. Therefore, when comparing subsequent scans echoes, desirable targets will appear to move and all stationary echoes can be eliminated. Sea clutter can be reduced by using horizontal polarization, while rain is reduced with circular polarization (note that meteorological radars wish for the opposite effect, therefore using linear polarization the better to detect precipitation). Other methods attempt to increase the signal-to-clutter ratio.
Constant False Alarm Rate (CFAR, a form of Automatic Gain Control, or AGC) is a method relying on the fact that clutter returns far outnumber echoes from targets of interest. The receiver's gain is automatically adjusted to maintain a constant level of overall visible clutter. While this does not help detect targets masked by stronger surrounding clutter, it does help to distinguish strong target sources. In the past, radar AGC was electronically controlled and affected the gain of the entire radar receiver. As radars evolved, AGC became computer-software controlled, and affected the gain with greater granularity, in specific detection cells.
Clutter may also originate from multipath echoes from valid targets due to ground reflection, atmospheric ducting or ionospheric reflection/refraction (e.g. Anomalous propagation). This clutter type is especially bothersome, since it appears to move and behave like other normal (point) targets of interest, thereby creating a ghost. In a typical scenario, an aircraft echo is multipath-reflected from the ground below, appearing to the receiver as an identical target below the correct one. The radar may try to unify the targets, reporting the target at an incorrect height, or—worse—eliminating it on the basis of jitter or a physical impossibility. These problems can be overcome by incorporating a ground map of the radar's surroundings and eliminating all echoes which appear to originate below ground or above a certain height. In newer Air Traffic Control (ATC) radar equipment, algorithms are used to identify the false targets by comparing the current pulse returns, to those adjacent, as well as calculating return improbabilities due to calculated height, distance, and radar timing.
Jamming is problematic to radar since the jamming signal only needs to travel one-way (from the jammer to the radar receiver) whereas the radar echoes travel two-ways (radar-target-radar) and are therefore significantly reduced in power by the time they return to the radar receiver. Jammers therefore can be much less powerful than their jammed radars and still effectively mask targets along the line of sight from the jammer to the radar (''Mainlobe Jamming''). Jammers have an added effect of affecting radars along other lines of sight, due to the radar receiver's sidelobes (''Sidelobe Jamming'').
Mainlobe jamming can generally only be reduced by narrowing the mainlobe solid angle, and can never fully be eliminated when directly facing a jammer which uses the same frequency and polarization as the radar. Sidelobe jamming can be overcome by reducing receiving sidelobes in the radar antenna design and by using an omnidirectional antenna to detect and disregard non-mainlobe signals. Other anti-jamming techniques are frequency hopping and polarization. See Electronic counter-counter-measures for details.
Interference has recently become a problem for C-band (5.66 GHz) meteorological radars with the proliferation of 5.4 GHz band WiFi equipment.
One way to measure the distance to an object is to transmit a short pulse of radio signal (electromagnetic radiation), and measure the time it takes for the reflection to return. The distance is one-half the product of the round trip time (because the signal has to travel to the target and then back to the receiver) and the speed of the signal. Since radio waves travel at the speed of light (186,000 miles per second or 300,000,000 meters per second), accurate distance measurement requires high-performance electronics.
In most cases, the receiver does not detect the return while the signal is being transmitted. Through the use of a device called a ''duplexer'', the radar switches between transmitting and receiving at a predetermined rate. The minimum range is calculated by measuring the length of the pulse multiplied by the speed of light, divided by two. In order to detect closer targets one must use a shorter pulse length.
A similar effect imposes a maximum range as well. If the return from the target comes in when the next pulse is being sent out, once again the receiver cannot tell the difference. In order to maximize range, longer times between pulses should be used, referred to as a pulse repetition time (PRT), or its reciprocal, pulse repetition frequency (PRF).
These two effects tend to be at odds with each other, and it is not easy to combine both good short range and good long range in a single radar. This is because the short pulses needed for a good minimum range broadcast have less total energy, making the returns much smaller and the target harder to detect. This could be offset by using more pulses, but this would shorten the maximum range again. So each radar uses a particular type of signal. Long-range radars tend to use long pulses with long delays between them, and short range radars use smaller pulses with less time between them. This pattern of pulses and pauses is known as the pulse repetition frequency (or PRF), and is one of the main ways to characterize a radar. As electronics have improved many radars now can change their PRF thereby changing their range. The newest radars fire 2 pulses during one cell, one for short range 10 km / 6 miles and a separate signal for longer ranges 100 km /60 miles.
The distance resolution and the characteristics of the received signal as compared to noise depends heavily on the shape of the pulse. The pulse is often modulated to achieve better performance using a technique known as pulse compression.
Distance may also be measured as a function of time. The radar mile is the amount of time it takes for a radar pulse to travel one nautical mile, reflect off a target, and return to the radar antenna. Since a nautical mile is defined as ''exactly'' 1,852 meters, then dividing this distance by the speed of light (''exactly'' 299,792,458 meters per second), and then multiplying the result by 2 (round trip = twice the distance), yields a result of approximately 12.36 microseconds in duration.
This technique can be used in continuous wave radar, and is often found in aircraft radar altimeters. In these systems a "carrier" radar signal is frequency modulated in a predictable way, typically varying up and down with a sine wave or sawtooth pattern at audio frequencies. The signal is then sent out from one antenna and received on another, typically located on the bottom of the aircraft, and the signal can be continuously compared using a simple ''beat frequency'' modulator that produces an audio frequency tone from the returned signal and a portion of the transmitted signal.
Since the signal frequency is changing, by the time the signal returns to the aircraft the broadcast has shifted to some other frequency. The amount of that shift is greater over longer times, so greater frequency differences mean a longer distance, the exact amount being the "ramp speed" selected by the electronics. The amount of shift is therefore directly related to the distance traveled, and can be displayed on an instrument. This signal processing is similar to that used in speed detecting Doppler radar. Example systems using this approach are AZUSA, MISTRAM, and UDOP.
A further advantage is that the radar can operate effectively at relatively low frequencies, comparable to that used by UHF television. This was important in the early development of this type when high frequency signal generation was difficult or expensive.
A new terrestrial radar uses low-power FM signals that cover a larger frequency range. The multiple reflections are analyzed mathematically for pattern changes with multiple passes creating a computerized synthetic image. Doppler effects are not used which allows slow moving objects to be detected as well as largely eliminating "noise" from the surfaces of bodies of water. Used primarily for detection of intruders approaching in small boats or intruders crawling on the ground toward an objective.
However, if the transmitter's output is coherent (phase synchronized), there is another effect that can be used to make almost instant speed measurements (no memory is required), known as the Doppler effect. Most modern radar systems use this principle in the pulse-doppler radar system. Return signals from targets are shifted away from this base frequency via the Doppler effect enabling the calculation of the speed of the object relative to the radar. The Doppler effect is only able to determine the relative speed of the target along the line of sight from the radar to the target. Any component of target velocity perpendicular to the line of sight cannot be determined by using the Doppler effect alone, but it can be determined by tracking the target's azimuth over time. Additional information of the nature of the Doppler returns may be found in the radar signal characteristics article.
It is also possible to make a radar without any pulsing, known as a continuous-wave radar (CW radar), by sending out a very pure signal of a known frequency. CW radar is ideal for determining the radial component of a target's velocity, but it cannot determine the target's range. CW radar is typically used by traffic enforcement to measure vehicle speed quickly and accurately where range is not important.
Other mathematical developments in radar signal processing include time-frequency analysis (Weyl Heisenberg or wavelet), as well as the chirplet transform which makes use of the fact that radar returns from moving targets typically "chirp" (change their frequency as a function of time, as does the sound of a bird or bat).
Early systems tended to use omni-directional broadcast antennas, with directional receiver antennas which were pointed in various directions. For instance the first system to be deployed, Chain Home, used two straight antennas at right angles for reception, each on a different display. The maximum return would be detected with an antenna at right angles to the target, and a minimum with the antenna pointed directly at it (end on). The operator could determine the direction to a target by rotating the antenna so one display showed a maximum while the other shows a minimum.
One serious limitation with this type of solution is that the broadcast is sent out in all directions, so the amount of energy in the direction being examined is a small part of that transmitted. To get a reasonable amount of power on the "target", the transmitting aerial should also be directional.
Parabolic reflectors can be either symmetric parabolas or spoiled parabolas:
Applied similarly to the parabolic reflector, the slotted waveguide is moved mechanically to scan and is particularly suitable for non-tracking surface scan systems, where the vertical pattern may remain constant. Owing to its lower cost and less wind exposure, shipboard, airport surface, and harbour surveillance radars now use this in preference to the parabolic antenna.
Phased array radars have been in use since the earliest years of radar use in World War II, but limitations of the electronics led to fairly poor accuracy. Phased array radars were originally used for missile defense. They are the heart of the ship-borne Aegis combat system, and the Patriot Missile System, and are increasingly used in other areas because the lack of moving parts makes them more reliable, and sometimes permits a much larger effective antenna, useful in fighter aircraft applications that offer only confined space for mechanical scanning.
As the price of electronics has fallen, phased array radars have become more and more common. Almost all modern military radar systems are based on phased arrays, where the small additional cost is far offset by the improved reliability of a system with no moving parts. Traditional moving-antenna designs are still widely used in roles where cost is a significant factor such as air traffic surveillance, weather radars and similar systems.
Phased array radars are also valued for use in aircraft, since they can track multiple targets. The first aircraft to use a phased array radar was the B-1B Lancer. The first aircraft fighter to use phased array radar was the Mikoyan MiG-31. The MiG-31M's SBI-16 Zaslon phased array radar is considered to be the world's most powerful fighter radar . Phased-array interferometry or, aperture synthesis techniques, using an array of separate dishes that are phased into a single effective aperture, are not typically used for radar applications, although they are widely used in radio astronomy. Because of the Thinned array curse, such arrays of multiple apertures, when used in transmitters, result in narrow beams at the expense of reducing the total power transmitted to the target. In principle, such techniques used could increase the spatial resolution, but the lower power means that this is generally not effective. Aperture synthesis by post-processing of motion data from a single moving source, on the other hand, is widely used in space and airborne radar systems (see Synthetic aperture radar).
Other users of the radio spectrum, such as the broadcasting and electronic countermeasures (ECM) industries, have replaced the traditional military designations with their own systems.
+ Radar frequency bands | ||||
!Band name!!Frequency range!!Wavelength range!!Notes | ||||
3–30 Megahertz | MHz|| | metre>m | coastal radar systems, over-the-horizon radar (OTH) radars; 'high frequency' | |
P | < 300 MHz| | 1 m+ | 'P' for 'previous', applied retrospectively to early radar systems | |
VHF | 30–300 MHz| | 1–10 m | Very long range, ground penetrating; 'very high frequency' | |
UHF | 300–1000 MHz| | 0.3–1 m | Ballistic Missile Early Warning System>ballistic missile early warning), ground penetrating, foliage penetrating; 'ultra high frequency' | |
L band | L | 1–2 GigahertzGHz|| | centimetre>cm | Long range air traffic control and surveillance; 'L' for 'long' |
S band | S | 2–4 GHz| | 7.5–15 cm | Moderate range surveillance, Terminal air traffic control, long-range weather, marine radar; 'S' for 'short' |
C band | C | 4–8 GHz| | 3.75–7.5 cm | Satellite transponders; a compromise (hence 'C') between X and S bands; weather; long range tracking |
X band | X | 8–12 GHz| | 2.5–3.75 cm | Missile guidance, marine radar, weather, medium-resolution mapping and ground surveillance; in the USA the narrow range 10.525 GHz ±25 MHz is used for airport radar; short range tracking. Named X band because the frequency was a secret during WW2. |
Ku | 12–18 GHz| | 1.67–2.5 cm | high-resolution | |
K band | K | 18–24 GHz| | 1.11–1.67 cm | from German language |
[[Ka band | Ka | 24–40 GHz| | 0.75–1.11 cm | mapping, short range, airport surveillance; frequency just above K band (hence 'a') Photo radar, used to trigger cameras which take pictures of license plates of cars running red lights, operates at 34.300 ± 0.100 GHz. |
mm | 40–300 GHz| | 7.5 mm – 1 mm | millimetre band, subdivided as below. The frequency ranges depend on waveguide size. Multiple letters are assigned to these bands by different groups. These are from Baytron, a now defunct company that made test equipment. | |
V band | V | 40–75 GHz| | 4.0–7.5 mm | Very strongly absorbed by atmospheric oxygen, which resonates at 60 GHz. |
W band | W | 75–110 GHz| | 2.7–4.0 mm | used as a visual sensor for experimental autonomous vehicles, high-resolution meteorological observation, and imaging. |
Ultra-wideband | UWB | 1.6–10.5 GHz| | 18.75 cm – 2.8 cm | used for through-the-wall radar and imaging systems. |
hybrid mixers, fed by a waveform generator and an exciter for a complex but coherent waveform. This waveform can be generated by low power/low-voltage input signals. In this case the radar transmitter must be a power-amplifier, e.g. a klystron tube or a solid state transmitter. In this way, the transmitted pulse is intrapulsemodulated and the radar receiver must use pulse compression technique mostly.
Coolanol (silicate ester) was used in several military radars in the 1970s, for example the AN/APG-63 in the F-15. However, it is hygroscopic, leading to formation of highly flammable alcohol. The loss of a U.S. Navy aircraft in 1978 was attributed to a silicate ester fire. Coolanol is also expensive and toxic. The U.S. Navy has instituted a program named Pollution Prevention (P2) to reduce or eliminate the volume and toxicity of waste, air emissions, and effluent discharges. Because of this Coolanol is used less often today.
PAO is a synthetic lubricant blend of a polyol ester admixed with effective amounts of an antioxidant, yellow metal pacifier and rust inhibitors. The polyol ester blend includes a major proportion of poly (neopentyl polyol) ester blend formed by reacting poly(pentaerythritol) partial esters with at least one C7 to C12 carboxylic acid mixed with an ester formed by reacting a polyol having at least two hydroxyl groups and at least one C8-C10 carboxylic acid. Preferably, the acids are linear and avoid those which can cause odours during use. Effective additives include secondary arylamine antioxidants, triazole derivative yellow metal pacifier and an amino acid derivative and substituted primary and secondary amine and/or diamine rust inhibitor.
A synthetic coolant/lubricant composition, comprising an ester mixture of 50 to 80 weight percent of poly (neopentyl polyol) ester formed by reacting a poly (neopentyl polyol) partial ester and at least one linear monocarboxylic acid having from 6 to 12 carbon atoms, and 20 to 50 weight percent of a polyol ester formed by reacting a polyol having 5 to 8 carbon atoms and at least two hydroxyl groups with at least one linear monocarboxylic acid having from 7 to 12 carbon atoms, the weight percents based on the total weight of the composition.
Radars configurations include Monopulse radar, Bistatic radar, Doppler radar, Continuous-wave radar, etc.. depending on the types of hardware and software used. It is used in aviation (Primary and secondary radar), sea vessels, law enforcement, weather surveillance, ground mapping, geophysical surveys, and biological research.
Category:Avionics Category:Aircraft instruments Category:Aviation terminology Category:Radar Category:Microwave technology Category:Measuring instruments Category:Navigational equipment Category:Air traffic control Category:Acronyms Category:Science and technology during World War II Category:Targeting (warfare)
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Coordinates | 12°2′36″N77°1′42″N |
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years active | 1992–present |
background | solo_singer |
birth name | Britney Jean Spears |
birth date | December 02, 1981 |
birth place | |
genre | Pop, dance |
occupation | Singer, songwriter, dancer, actress, record producer, author, fashion designer, video director |
instrument | Vocals, piano |
label | Jive |
associated acts | InnosenseThe New Mickey Mouse Club |
website | }} |
In 2001, she released her third studio album ''Britney'' and expanded her brand, playing the starring role in the film ''Crossroads''. She assumed creative control of her fourth studio album, ''In the Zone'' (2003), which yielded chart-topping singles "Me Against the Music", "Toxic" and "Everytime". After the release of two compilation albums, Spears experienced personal struggles and her career went under hiatus. Her fifth studio album, ''Blackout'', was released in 2007 and despite receiving little promotion, it spawned hits "Gimme More" and "Piece of Me". In 2008, her erratic behavior and hospitalizations caused her to be placed in a conservatorship. The same year, her sixth studio album ''Circus'' was released, with the global chart-topping lead single "Womanizer". She embarked on her highest-grossing global concert tour, The Circus Starring Britney Spears, in 2009. Her seventh studio album ''Femme Fatale'', released in 2011, has become the first of her albums to yield three top ten singles in the United States.
Spears has sold over 100 million records worldwide. According to the Recording Industry Association of America (RIAA), she is the eighth top-selling female artist in the United States, with 33 million certified albums. Spears is also recognized as the best-selling female artist of the first decade of the 21st century, as well as the fifth overall. She was ranked the 8th Artist of the 2000s by ''Billboard''. In June 2010, Spears was ranked sixth on ''Forbes'' list of the 100 Most Powerful and Influential celebrities in the world; she is also the third most mentioned musician on the internet, according to ''Forbes''.
In June 1997, Spears was in talks with manager Lou Pearlman to join female pop group Innosense. Lynne asked family friend and entertainment lawyer Larry Rudolph for his opinion and submitted a tape of Spears singing over a Whitney Houston karaoke song along with some pictures. Rudolph decided he wanted to pitch her to record labels, therefore she needed a professional demo. He sent Spears an unused song from Toni Braxton; she rehearsed for a week and recorded her vocals in a studio with a sound engineer. Spears traveled to New York with the demo and met with executives from four labels, returning to Kentwood the same day. Three of the labels rejected her, arguing audiences wanted pop bands such as the Backstreet Boys and the Spice Girls, and "there wasn't going to be another Madonna, another Debbie Gibson, or another Tiffany." Two weeks later, executives from Jive Records returned calls to Rudolph. Senior vice president of A&R; Jeff Fenster stated about Spears's audition that "It's very rare to hear someone that age who can deliver emotional content and commercial appeal. [...] For any artist, the motivation—the 'eye of the tiger'— is extremely important. And Britney had that." They appointed her to work with producer Eric Foster White for a month, who reportedly shaped her voice from "lower and less poppy" delivery to "distinctively, unmistakably Britney." After hearing the recorded material, president Clive Calder ordered a full album. Spears had originally envisioned "Sheryl Crow music, but younger more adult contemporary" but felt all right with her label's appointment of producers, since "It made more sense to go pop, because I can dance to it—it's more me." She flew to Cheiron Studios in Stockholm, Sweden, where half of the album was recorded from March to April 1998, with producers Max Martin, Denniz Pop and Rami Yacoub, among others.
The April 1999 cover of ''Rolling Stone'' featured Spears lying on her bed, clad with a bra, shorts and an open top. The American Family Association (AFA) referred to the shoot as "a disturbing mix of childhood innocence and adult sexuality" and called to "God-loving Americans to boycott stores selling Britney's albums." Spears responded to the outcry commenting, "What's the big deal? I have strong morals. [...] I'd do it again. I thought the pictures were fine. And I was tired of being compared to Debbie Gibson and all of this bubblegum pop all the time." Shortly before, Spears had announced publicly she would remain a virgin until marriage. On June 28, 1999, Spears began her first headlining ...Baby One More Time Tour in North America, which was positively received by critics, but generated some controversy due to her racy outfits. An extension of the tour, titled Crazy 2k, followed in March 2000. Spears premiered songs from her upcoming second album during the show. ''Oops!... I Did It Again'', her second studio album, was released in May 2000. It debuted at number one in the US, selling 1,3 million copies, breaking the SoundScan record for the highest debut sales by any solo artist. The album sold over 20 million copies worldwide. Rob Sheffield of ''Rolling Stone'' said that "the great thing about ''Oops!'' – under the cheese surface, Britney's demand for satisfaction is complex, fierce and downright scary, making her a true child of rock & roll tradition." The album's lead single, "Oops!... I Did It Again", peaked at the top of the charts in Australia, New Zealand, the United Kingdom and many other European nations. The album as well as the title track received Grammy nominations for Best Pop Vocal Album and Best Female Pop Vocal Performance, respectively.
The same year, Spears embarked on the Oops!... I Did It Again World Tour, which grossed $40.5 million; she also released her first book, ''Britney Spears' Heart-to-Heart'', co-written with her mother. On September 7, 2000, Spears performed at the 2000 MTV Video Music Awards. Halfway through the performance, she ripped off her black suit to reveal a sequined flesh-colored bodysuit, followed by heavy dance routine. It is noted by critics as the moment that Spears showed signs of becoming a more provocative performer. Amidst media speculation, Spears confirmed she was dating 'N Sync member Justin Timberlake.
Spears's performance of the single at the 2001 MTV Video Music Awards featured a caged tiger and a large albino python draped over her shoulders. It was harshly received by animal rights organization PETA, who claimed the animals were mistreated and scrapped plans for an anti-fur billboard that was to feature Spears. To support the album, Spears embarked on the Dream Within a Dream Tour. The show was critically praised for its technical innovations, the ''pièce de résistance'' being a water screen that pumped two tons of water into the stage. The tour grossed $43.7 million, becoming the second highest grossing tour of 2002 by a female artist, behind Cher's Farewell Tour. Her career success was highlighted by ''Forbes'' in 2002, as Spears was ranked the world's most powerful celebrity. Spears also landed her first starring role in ''Crossroads'', released in February 2002. Although the film was largely panned, most critics actually praised Spears's acting. ''Crossroads'', which had a $11 million budget, went on to gross over $57 million worldwide. In June 2002, Spears opened her first restaurant, Nyla, in New York City, but terminated her relationship in November, citing mismanagement and "management's failure to keep her fully apprised". In July 2002, Spears announced she would take a six month break from her career; however, she went back into the studio in October to record her new album. Spears's relationship with Justin Timberlake ended after three years. In December 2002, Timberlake released the song "Cry Me a River" as the second single from his solo debut album. The music video featured a Spears look-alike and fueled the rumors that she had been unfaithful to him. As a response, Spears wrote the ballad "Everytime" with her backing vocalist and friend Annet Artani. The same year, Limp Bizkit frontman Fred Durst confirmed that he was in a relationship with Spears, only to deny it later. In a 2009 interview, he explained that "I just guess at the time it was taboo for a guy like me to be associated with a gal like her." Spears opened the 2003 MTV Video Music Awards with Christina Aguilera, performing "Like a Virgin". Halfway through they were joined by Madonna, with whom they both kissed. The incident was highly publicized.
Spears released her fourth studio album, ''In the Zone'', in November 2003. She assumed more creative control by writing and co-producing most of the material. ''Vibe'' called it "A supremely confident dance record that also illustrates Spears's development as a songwriter." NPR listed the album as one of "The 50 Most Important Recording of the Decade", adding that "the decade's history of impeccably crafted pop is written on her body of work." ''In the Zone'' sold over 609,000 copies in the United States and debuted at the top of the charts, making Spears the first female artist in the SoundScan era to have her first four studio albums to debut at number one. It also debuted at the top of the charts in France and the top ten in Belgium, Denmark, Sweden and the Netherlands. ''In the Zone'' sold over 10 million copies worldwide. The album produced the hit singles: "Me Against the Music", a collaboration with Madonna; "Toxic"—which won a Grammy for Best Dance Recording; "Everytime" and "Outrageous".
In July 2004, she announced her engagement to American dancer Kevin Federline, whom she had met three months before. The romance received intense attention from the media, since Federline had recently broken up with actress Shar Jackson, who was still pregnant with their second child at the time. The initial stages of their relationship were chronicled in Spears's first reality show ''Britney & Kevin: Chaotic''. They held a wedding ceremony on September 18, 2004, but were not legally married until three weeks later on October 6 due to a delay finalizing the couple's prenuptial agreement. Shortly after, she released her first fragrance with Elizabeth Arden, ''Curious'', which broke the company's first-week gross for a perfume. In October 2004, Spears announced she would be taking another career break to start a family. ''Greatest Hits: My Prerogative'', her first greatest hits compilation album, was released in November 2004. Spears's cover version of Bobby Brown's "My Prerogative" was released as the lead single from the album, reaching the top of the charts in Finland, Ireland, Italy and Norway. The second single, "Do Somethin'", was a top ten hit in Australia, the United Kingdom and other countries of mainland Europe. Worldwide, ''Greatest Hits: My Prerogative'' sold over 5 million copies. In late 2004, Spears went on KIIS-FM radio in Los Angeles, CA to play a new demo titled "Mona Lisa." The demo was to be the first single from an upcoming album called the "Original Doll." However, Spears' label later cancelled the album for unknown reasons. Spears gave birth to her first child, Sean Preston Federline, on September 14, 2005.
In November 2005, she released her first remix compilation, ''B in the Mix: The Remixes'', which consists of eleven remixes. In February 2006, pictures surfaced of Spears driving with her son Sean, on her lap instead of in a car seat. Child advocates were horrified by the photos of her holding the wheel with one hand and Sean with the other. Spears claimed that the situation happened because of a frightening encounter with paparazzi, and that it was a mistake on her part. The following month, she guest-starred on the ''Will & Grace'' episode "Buy, Buy Baby" as closeted lesbian Amber Louise. She publicly announced she no longer studied Kabbalah in June 2006, explaining, "my baby is my religion." Two months later, Spears posed nude for the cover of ''Harper's Bazaar''. The picture was heavily compared to Demi Moore's August 1991 ''Vanity Fair'' cover. She gave birth to her second child, Jayden James Federline, on September 12, 2006. On November 7, 2006, Spears filed for divorce from Federline, citing irreconcilable differences. Their divorce was finalized in July 2007, when the couple reached a global settlement and agreed to share joint custody of their children. Spears's aunt Sandra Bridges Covington, with whom she had been very close, died of ovarian cancer in January. On February 16, 2007, Spears stayed in a drug rehabilitation facility in Antigua for less than a day. The following night, she shaved her head with electric clippers at a hair salon in Tarzana, Los Angeles. She admitted herself to other treatment facilities during the following weeks. After completing a month-long program at Promises, she wrote on her website, "I truly hit rock bottom. Till this day I don't think that it was alcohol or depression. [...] was like a bad kid running around with ADD." In May 2007, she produced a series of promotional concerts at House of Blues venues, titled The M+M's Tour. Spears lost physical custody of her children to Federline on October 1, 2007. The reasons of the court ruling were not revealed to the public.
Her fifth studio album, ''Blackout'', was released in October 2007. It debuted at the top of charts in Canada and Ireland, number two in the U.S. ''Billboard'' 200,—held off from the top spot by Eagles's ''Long Road out of Eden''— France, Japan, Mexico and the United Kingdom and the top ten in Australia, Korea, New Zealand and many European nations. In the United States, Spears became the only female artist to have her first five studio albums debut at the two top slots of the chart. ''Blackout'' sold over 3.1 million copies worldwide. Peter Robinson of ''The Observer'' said that "Britney has delivered the best album of her career, raising the bar for modern pop music with an incendiary mix of Timbaland's ''Shock Value'' and her own back catalogue." Dennis Lim of ''Blender'' commented, "Spears’s fifth studio album is her most consistent, a seamlessly entertaining collection of bright, brash electropop." ''Blackout'' won Album of the Year at MTV Europe Music Awards 2008 and was listed as the fifth Best Pop Album of the Decade by ''The Times''. Spears performed the lead single "Gimme More" at the 2007 MTV Video Music Awards. The performance was panned by many critics. David Willis of BBC stated her performance would "go down in the history books as being one of the worst to grace the MTV Awards". Despite the backlash, the single rocketed to worldwide success, peaking at number one in Canada and the top ten in almost every country it charted. The second single "Piece of Me" reached the top of the charts in Ireland and reached the top five in Australia, Canada, Denmark, New Zealand and the United Kingdom. The third single "Break the Ice" was released the following year and had moderate success due to Spears not being able to promote it properly. In December 2007, Spears began a relationship with paparazzo Adnan Ghalib.
Her sixth studio album ''Circus'', was released in December 2008. It received positive reviews from critics; according to the music review aggregation of Metacritic, it garnered an average score of 64/100. ''Circus'' debuted at number one in Canada, Czech Republic and the United States, and inside the top in many European nations. In the United States, Spears became the youngest female artist to have five albums debut at number one, earning a place in the ''Guinness Book of World Records''. She also became the only act in the Soundscan era to have four albums debut with 500,000 or more copies sold. ''Circus'' became one of the fastest-selling albums of the year, and has sold 4 million copies worldwide. Its lead single, "Womanizer", became her first number one in the ''Billboard'' Hot 100 since "...Baby One More Time" and topped the charts in countries such as Belgium, Canada, Denmark, Finland, France, Norway and Sweden. It was also nominated for a Grammy in the category of Best Dance Recording. In January 2009, Spears and her father James obtained a restraining order against her former manager Sam Lufti, ex-boyfriend Adnan Ghalib and attorney Jon Eardley—all of whom, court documents claim, had been conspiring to gain control of Spears's affairs. The restraining order forbids Lutfi and Ghalib from contacting Spears or coming within 250 yards of her, her property or family members. Spears embarked on The Circus Starring Britney Spears in March 2009. With a gross of U.S. $131.8 million, it became the fifth highest grossing tour of the year.
She released her second greatest hits album, ''The Singles Collection'' in November 2009. "3" became her third number one single in the US, and was the first song to debut at the top of the charts in three years. Later that month, she released an application for iPhone and iPod Touch titled "It's Britney!". In May 2010, Spears's representatives confirmed she was dating her agent Jason Trawick, and that they had decided to end their professional relationship to focus on their personal relationship. Spears designed a limited edition clothing line for Candie's, which was released in stores in July 2010. On September 28, 2010, she made a cameo appearance on a Spears-themed tribute episode of American TV show ''Glee'', titled "Britney/Brittany". Spears approved of the episode, although her appearances received mixed reviews from critics. The episode drew ''Glee'''s second largest audience, as well as the show's highest ratings ever.
On March 2011, Spears announced that she would tour throughout the United States during summer 2011 The Femme Fatale Tour opened June 16 at the Power Balance Pavilion in Sacramento, California to positive reviews. Many critics noted that Spears sang more of the concert live in response to lip-synching accusations during The Circus Starring Britney Spears, and that the dancing is some of her best in years. The first ten US dates of the tour grossed $6.2 million, landing the fifty-fifth spot on Pollstar's Top 100 North American Tours list for the half-way point of the year. The tour will travel to Europe and South and Central America later in 2011. On August 12, Spears announced that her performances at the Air Canada Centre in Toronto will be taped to air on the EPIX television channel and for a DVD release, resulting in the doubling of traffic to EPIX social sites and 'Britney Spears' becoming a worldwide trending topic on Twitter. Her first televised concert since the Onyx Hotel Tour in 2004, the show, ''Britney Spears: Femme Fatale,'' was shot in 2D and 3D on August 13 and 14 and will premiere on Epix in November.
On June 15, 2011, it was announced by ''Billboard'' that the RCA/Jive Label Group would be splitting, with Jive Records going to a restructured Epic Records, and RCA Records staying intact. In August it was announced that Spears had officially joined the RCA's roster. During the 2011 MTV Video Music Awards on August 28 2011, MTV played tribute to Spears with a group of young female dancers that memorialised Britney's music videos, performances, and style. Following which, Spears accepted the MTV Video Vanguard Award from Lady Gaga, who said that "industry wouldn't be the same without [her]".
On September 9, 2011, Spears announced that her second remix album, ''B in the Mix: The Remixes Vol. 2'', will be released on October 11, along with the tracklist.
''Oops!...I Did It Again'' and subsequent albums saw Spears working with several contemporary R&B; producers, leading to "a combination of bubblegum, urban soul, and raga." Her third studio album, ''Britney'' derived from the teen pop niche, "[r]hythmically and melodically ... sharper, tougher than what came before. What used to be unabashedly frothy has some disco grit, underpinned by Spears' spunky self-determination that helps sell hooks that are already catchier, by and large, than those that populated her previous two albums." Guy Blackman of ''The Age'' wrote that while few would care to listen to an entire Spears album, "[t]he thing about Spears, though, is that her biggest songs, no matter how committee-created or impossibly polished, have always been convincing because of her delivery, her commitment and her presence. For her mostly teenage fans, Spears expresses perfectly the conflicting urges of adolescence, the tension between chastity and sexual experience, between hedonism and responsibility, between confidence and vulnerability."
Her vocal ability has also been criticized, often drawing unfavorable comparison to her pop rival, Christina Aguilera Critic Allan Raible derides her overdependence in Circus on digital effects and the robotic effect it creates. "She’s never been a strong vocalist..." writes Raible, "Could she handle these songs with stripped down arrangements and no vocal effects? More importantly, would anyone want to hear her attempt such a performance? Does it matter? No. The focus is still image over substance." Her image and persona are also often contrasted to Christina Aguilera. David Browne of ''Entertainment Weekly'' observed "Christina Aguilera may flash skin and belly button, but in her music and manner, she's too eager not to offend — she's a good girl pretending to be bad. Spears, however, comes across as a bad girl acting good ... Spears' artificial-sweetener voice is much less interesting than the settings, yet that blandness is actually a relief compared with Aguilera's numbing vocal gymnastics. In contrast, Allmusic comments: "Like her peer Christina Aguilera, Britney equates maturity with transparent sexuality and the pounding sounds of nightclubs ... Where Christina comes across like a natural-born skank, Britney is the girl next door cutting loose at college, drinking and smoking and dancing and sexing just a little too recklessly, since this is the first time she ''can'' indulge herself. Sal Cinquemani of Slant Magazine notes, "The disparity between Aguilera and Spears can't be measured solely by the timbre and octave range of their voices ... [Aguilera's] popularity has never reached the fever pitch of Britney's."
Like other dance-oriented pop stars, it has been widely reported that Spears lip-syncs in concert. Author Gary Giddins wrote in his book ''Natural selection: Gary Giddins on comedy, film, music, and books'' (2006) that "among many other performers accused of moving their lips while a machine does the labor are Britney Spears, Luciano Pavarotti, Shania Twain, Beyoncé, and Madonna." Rashod D. Ollison of ''The Baltimore Sun'' observes: "Many pop stars ... feel they have no choice but to seek vocal enhancement. Since the advent of MTV and other video music channels, pop audiences have been fed elaborate videos thick with jaw-dropping effects, awesome choreography, fabulous clothes, marvelous bodies. And the same level of perfection is expected to extend beyond the video set to the concert stage. So if Britney Spears, Janet Jackson or Madonna sounds shrill and flat without a backing track, fans won't pay up to $300 for a concert ticket." Giddins adds, "it was reported Britney Spears fans prefer her to lip-sync—despite her denials of doing so (contradicted by her own director)—because they expect flawless digitalization when they pay serious money for a concert."
In Australia, NSW Fair Trading Minister Virginia Judge has advised disclaimers be printed on any ticket for concerts which contain any prerecorded vocals. She commented: "There could have been some instances where people actually go and purchase a ticket thinking that they're going to have a live performance ... for some people that means that everything is live, it's fresh, it happens instantaneously, it's not something that's been pre-recorded. You want to make sure that they're actually paying for what they think they're getting." Noting on the prevalence of lip-syncing, ''Los Angeles Daily News'' reported "in the context of a Britney Spears concert, does it really matter? Like a Vegas revue show, you don't go to hear the music, you go for the somewhat-ridiculous spectacle of it all". Similarly, Aline Mendelsohn of the ''Orlando Sentinel'' remarked: "Let's get one thing straight: A Britney Spears concert is not about the music ... you have to remember that it's about the sight, not the sound." Critic Glenn Gamboa comments her concert tours are "like her life—a massive money-making venture designed to play up her talents and distract from her shortcomings with a mix of techno-tinged sex appeal and disco-flavored flash. And, like her life, it is, more or less, a success.
Many critics have argued that Spears should not be considered in the same league of talent as Jackson or Madonna. Journalists Erika Montalvo and Jackie Sheppard of the ''Rocky Mountain Collegian'' observed "[s]ome may argue that Spears is not only a good recording artist but also an important cultural icon." However, in examining her level of skill as an artist, it is questioned that "[a]lthough she has been classified among female elites such as Janet Jackson and Madonna, what does Ms. Spears really have in common with these divas of rock?" Joan Anderman of ''The Boston Globe'' remarked that "[t]hirteen costume changes in 90 minutes won't bless her with Madonna's intelligence or cultural barometer. An army of cutting-edge R&B; producers won't supply her with Janet Jackson's sense of humor or sincere smile ... Britney's heroes aren't great singers. But they're real singers. Spears sounds robotic, nearly inhuman, on her records, so processed is her voice by digital pitch-shifters and synthesizers."
Reporter Ed Bumgardner commented her transition from teen pop start to adult sex symbol with her third studio album ''Britney'' "takes its cues from two other successful performers—Madonna and Janet Jackson—both of whom she brazenly rips off and both of whom, like Spears, are passable singers, at best." Critic Shane Harrison wrote: "From the minimalist thump and "Nasty" feel of "I'm a Slave 4 U" to the scattered quotes in "Boys", [''Britney''] feels like [Spears's] attempt at 'Control'."
Citing Jackson's resolve to incorporate personal and social issues into her work and Madonna's ability to constantly redefine the boundaries of socially acceptable material in the industry, Spears's catalog ultimately pales in comparison, because "[w]hile Jackson and Madonna wrote their own music about subjects of importance, [Spears's] music sounds like an upbeat version of either, 'I want to grow up but the media won't let me,' or 'Here kitty, kitty, I'm wearing my underwear outside of my leather pants'-type ballads." In contrast, Guy Blackman argues that although "no one would argue that Spears is some kind of pioneering pop auteur, there’s still a lot to like about her back catalogue. During her world-conquering peak, she was just about as cutting edge as you could get in the world of global pop superstardom. Spears didn’t just work with big names, she gave big names their names, and maintained her high currency in the world’s most fickle industry for years, when most aspiring starlets are lucky to manage months."
After meeting Spears face to face, Janet Jackson stated: "she said to me, 'I'm such a big fan; I really admire you.' That's so flattering. Everyone gets inspiration from some place. And it's awesome to see someone else coming up who's dancing and singing, and seeing how all these kids relate to her. A lot of people put it down, but what she does is a positive thing." Madonna's respect for Spears has also been a subject of observation. Santiago Fouz-Hernández and Freya Jarman-Ivens, authors of ''Madonna's drowned worlds: new approaches to her cultural transformations, 1983-2003'' (2004) note that the most well known cross-generational relationship exists between Spears and Madonna in which "the entertainment newsmedia almost became obsessed with their relationship of mutual admiration." The biographers also report "[s]ome observers of popular culture, however, feel that the comparisons between the two artist are meaningless and fail to recognize Madonna's unique contribution: Madonna was never 'just another pop star' whereas Britney can more easily be seen as a standard manufactured pop act."
Barbara Ellen of ''The Observer'' has reported: "Spears is famously one of the 'oldest' teenagers pop has ever produced, almost middle aged in terms of focus and determination. Many 19-year-olds haven't even started working by that age, whereas Britney, a former Mouseketeer, was that most unusual and volatile of American phenomena — a child with a full-time career. While other little girls were putting posters on their walls, Britney was wanting to be the poster on the wall. Whereas other children develop at their own pace, Britney was developing at a pace set by the ferociously competitive American entertainment industry". 'Britney Spears' was Yahoo!'s most popular search term between 2005 and 2008, and has been in a total of seven different years. Spears was named as Most Searched Person in the ''Guinness World Records'' book edition 2007 and 2009. Spears has also become a major influence among many new artists, including Kristinia DeBarge, Lady Gaga, Little Boots, Selena Gomez & the Scene, Pixie Lott and Miley Cyrus who has cited Spears as one of her biggest inspirations and has also referenced Spears in her hit song "Party in the U.S.A.". Spears' personal breakdown was also cited as an inspiration for Barry Manilow's album "''15 Minutes''".
In 2011, Adam Markovitz of ''Entertainment Weekly'' commented on the cultural significance of Spears' voice and music. "We don't ask a whole lot from Britney Spears as an entertainer...we'll still send her straight up the charts simply because she's Britney. She's an American institution, as deeply sacred and messed up as pro wrestling or the filibuster. Musically, though, Spears will always have to measure up to her own gold standards of pop euphony: the operatic slither of 2004's 'Toxic' and the candied funk of 2000's 'Oops!...I Did It Again.' Spears is no technical singer, that's for sure. But backed by Martin and Dr. Luke's wall of pound, her vocals melt into a mix of babytalk coo and coital panting that is, in its own overprocessed way, just as iconic and propulsive as Michael Jackson's yips or Eminem's snarls."
Bebo Norman wrote a song about Spears, called "Britney", which was released as a single. Boy band Busted also wrote a song about Spears called "Britney", which was on their debut album. She is also mentioned in P!nk's song "Don't Let Me Get Me". She was cited as the inspiration of Gwyneth Paltrow's character in the 2010 film ''Country Strong''. Richard Cheese called Britney Spears "a remarkable recording artist" and also went on to say that she was "versatile" and what the industry calls an "artist". ''People'' magazine and MTV reported that October 1, 2008, the Bronx's John Philip Sousa Middle School, named their music studio in honor of Britney Spears. Spears herself was present during the ceremony and donated $10,000 to the school's music program.
Category:1981 births Category:21st-century actors Category:Actors from Louisiana Category:American child singers Category:American dance musicians Category:American dancers Category:American female pop singers Category:American female singers Category:American film actors Category:American music video directors Category:American musicians of English descent Category:American people of English descent Category:American people of Maltese descent Category:American pop singers Category:American singer-songwriters Category:American stage actors Category:American television actors Category:Baptists from the United States Category:English-language singers Category:Grammy Award winners Category:Innosense members Category:Jive Records artists Category:RCA Records artists Category:Living people Category:Mouseketeers Category:Musicians from Louisiana Category:Parklane Academy alumni Category:Participants in American reality television series Category:People from Kentwood, Louisiana Category:Sony BMG artists Category:World Music Awards winners
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Coordinates | 12°2′36″N77°1′42″N |
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name | Doug White |
state senate | Ohio |
state | Ohio |
district | 14th |
term | April 16, 1996-December 31, 2004 |
preceded | Cooper Snyder |
succeeded | Tom Niehaus |
state house2 | Ohio |
state2 | Ohio |
district2 | 88th |
term2 | January 5, 1991-April 15, 1996 |
preceded2 | Harry Mallott |
succeeded2 | Dennis Stapleton |
party | Republican |
Doug White of Manchester, Ohio, is an American politician of the Republican party who served as president of the Ohio Senate for two years, from 2003 to 2005.
An Adams County Commissioner from 1985-1990, White opted to run against Democrat Harry Mallott in 1990 for a seat in the Ohio House of Representatives. He was successful, and was seated in 1991. He won reelection in 1992, and 1994.
By 1996, Senator Cooper Snyder announced his retirement from the Ohio Senate after 17 years. Subsequently, White announced his candidacy for the seat. Ultimately Snyder would resign early, allowing the Senate Republicans to appoint White to the seat early, which they did.
After the 2002 elections, the Republicans of the Ohio Senate selected White to succeed Richard Finan as leader of the party. By 2004, however, White had already served two terms in the Senate and Ohio's term limits law prevented him from running again. Thus, in the 2004 election, Tom Niehaus took White's seat and Bill Harris was chosen to be the next Senate president.
After his service in the Senate, White served as Director of the Ohio Department of Commerce in the Cabinet of Republican Bob Taft.
This text is licensed under the Creative Commons CC-BY-SA License. This text was originally published on Wikipedia and was developed by the Wikipedia community.
Coordinates | 12°2′36″N77°1′42″N |
---|---|
name | White Lion |
background | group_or_band |
origin | New York City, New York, United States |
years active | 1983–19921999–present |
genre | Glam metal, hard rock, Heavy metal |
label | Atlantic, Frontiers |
associated acts | Mabel, Freak of Nature, Pride & Glory, Megadeth, Anthrax, Zakk Wylde, Black Sabbath, AntiProduct, Alice Cooper, Y&T; |
current members | Mike TrampJamie LawTroy Patrick FarrellClaus LangeskovHenning Wanner |
past members | Vito BrattaJames LoMenzoGreg D'AngeloFelix RobinsonNicki CapozziDave SpitzDan HemmerKasper DamgardNils KroyerBjarne T. HolmTommy T-Bone CaradonnaJimmy DeGrassoBruno Ravel }} |
White Lion is an American/Danish hard rock/heavy metal band that was formed in New York City in 1983 by Danish vocalist Mike Tramp and American guitarist Vito Bratta. Mainly active in the 1980s and early 1990s, the band achieved double platinum status with their #8 hit "Wait" and #3 hit "When the Children Cry" from their second album ''Pride''. The band continued their success with their third album ''Big Game''. After the fourth album ''Mane Attraction'', White Lion disbanded in 1992, but was reformed again by Tramp in 1999 with all new musicians.
White Lion was signed by Elektra Records in 1984 and recorded their debut album ''Fight to Survive''. Elektra was unhappy with the final recording, and after refusing to release the album, terminated their contract.
Both Capozzi and Robinson soon left the band. Nicki Capozzi was replaced by former Anthrax drummer Greg D'Angelo, and Felix Robinson was replaced by bassist Dave Spitz (brother of Anthrax guitarist Dan Spitz). Within a month of joining, however, Dave Spitz left to play bass with Black Sabbath and was replaced by James LoMenzo.
The album ''Fight to Survive'' was eventually re-recorded with new line-up and released in Japan by RCA Records in 1984. The small US independent label Grand Slam Records finally released ''Fight To Survive'' in the US on November 9, 1985. A few months later, Grand Slam Records went bankrupt.The album charted at number 151 on The Billboard 200.
In early 1986, White Lion, with a fictitious female member, had a brief part in the Tom Hanks/Shelley Long movie ''The Money Pit''.
The ''Pride'' tour started in July 1987 as White Lion opened for Ace Frehley's 80s band Frehley's Comet. The next year and a half was filled with constant touring, opening for such bands as Aerosmith, Ozzy Osbourne, Stryper and KISS. In January 1988 White Lion landed the opening slot for AC/DC on their ''Blow Up Your Video'' American tour.
While touring with AC/DC, the ''Pride'' album and "Wait" single finally charted, due in no small part to MTV airing the ''"Wait"'' music video in regular rotation—nearly seven months after the single's release. "Wait" hit #8 on the singles chart, while the ''Pride'' hit #11 on the album charts. ''Pride'' would remain on the Top 200 Billboard album charts for a full year selling two million copies in the US alone.
In August 1988, the album's second single "Tell Me" reached #58. Around the time this single was released, White Lion played at the Ritz club in New York City. The show was filmed and later aired on MTV.
The ''Pride'' album's third single, a power ballad titled "When the Children Cry", made it to #3 on the charts with heavy MTV airplay, making ''Pride'' one of about 20 hard rock albums to ever have multiple top 10 hits.
The success of "When the Children Cry" would eventually push sales of ''Pride'' over the two million mark. In addition, Vito Bratta was recognized for his instrumental talents by racking up Best New Guitarist awards with both ''Guitar World'' magazine and ''Guitar for the Practicing Musician'' magazine. All You Need Is Rock 'n' Roll was the final single released from the album.
In the spring of 1989, the ''Pride'' tour finally ended, and they immediately began work on their next album
After two years of writing and recording, White Lion released ''Mane Attraction'' in the summer of 1991. More of a "back to basics" album, centering on strong hooks and melodic hard rock, the album was received well by the fans. Unfortunately, the album failed to reach the top 20 like the last two albums, charting at #61 on The Billboard 200.. It received little or no airplay due to the recent Grunge explosion and subsequent backlash on all things "hair metal". The album also contained White Lion's only instrumental song, "Blue Monday", a tribute to Stevie Ray Vaughan, who had died while the band was writing for the album. The album featured the singles Lights and Thunder, Broken Heart '91 and Love Don't Come Easy which peaked at number 24 on The Mainstream Rock Charts.
Greg D'Angelo and James LoMenzo left the band soon after the album's release, citing "musical differences," but White Lion carried on with bassist Tommy T-Bone Caradonna and drummer Jimmy DeGrasso (Megadeth, Alice Cooper, Suicidal Tendencies, Y&T;, Fiona). After briefly touring in support of ''Mane Attraction'', Tramp and Bratta decided to fold the group, their last show being held in Boston at the Channel in September 1991. Exactly one year later in September 1992, the band's first compilation album was released titled ''The Best of White Lion''.
James LoMenzo and Greg D'Angelo joined Zakk Wylde's band, Lynyrd Skynhead, in the mid 90's which became the band Pride & Glory when Greg D'Angelo was replaced by Brian Tichy. Pride & Glory released one album, then James LoMenzo left the band. James went on to record and tour with ex-Van Halen frontman David Lee Roth and toured with Zakk Wylde's band Black Label Society. In February 2006, James joined the thrash band Megadeth on a permanent basis. Greg D'Angelo was the drummer for the band AntiProduct in 2006. Greg D'angelo recently joined Greg Leon Invasion featuring Greg Leon (formerly of Dokken and Quiet Riot).
Vito Bratta stayed briefly with Atlantic Records to help produce an album for CPR, and later tried to form a new music group that never panned out. Despite a dedicated worldwide following of guitar aficionados, Vito disappeared from public view from 1994 until his interview by Eddie Trunk live on February 16, 2007. Vito is also the sole owner of the original White Lions four album music catalogs. Retaining the rights after Mike sold all his rights to the catalogs in the mid 90's. They are owned by Vavoom music which is owned by Bratta.
In 2005, Mike Tramp organized another group of unknown musicians and due to legal issues with former members named the act Tramp's White Lion. 'TWL' (aka White Lion 2) played and re recorded White Lion songs, touring and releasing a double-live CD entitled ''Rocking the USA'' in 2005. In November and December 2006, Tramp's White Lion played several dates in Europe including Sweden, Norway, Spain, Italy, Greece, Turkey, Germany, Netherlands, Belgium and Denmark.
On February 16, 2007, Vito Bratta appeared on the Eddie Trunk radio show in New York, stating that despite what Mike Tramp said, he had never refused a White Lion reunion, stating that the only reason he was unable to participate was due to the illness of his father. He added that he would still be open to the idea and has not closed the door to returning to the music industry again. Trunk made it clear that Bratta's involvement in the show was something that he had wanted to happen since White Lion first broke up in 1991. Bratta took calls and answered questions from fans for almost 3 hours. On April 6 and 7, 2007, at the L'Amours Reunion Shows in New York, Bratta made his first public musical appearances in over 15 years.
Three weeks later Mike Tramp called the same show from Australia, speaking about Bratta and the band's new album, including the tour dates that Tramp's White Lion had recently confirmed. Tramp said that he was thankful that Bratta had finally answered fan's questions, the same questions he himself had been asked many times over the past 15 years. He also stated that he felt uncomfortable answering on Vito's behalf, and that he was upset that Vito had withdrawn himself from the music industry.
The band appeared at Rocklahoma in Pryor, OK on July 13, 2007 with Poison, Ratt, Quiet Riot, Slaughter, Y&T;, Gypsy Pistoleros, Dirty Penny, Greg Leon Invasion and Zendozer. After this festival they toured the US.
A new studio album entitled ''"Return of the Pride"'' was released on March 14, 2008 and the band was now once again simply known as White Lion. The band did a world tour to support the album. White Lion toured India and played to 42,000 at Shillong, Meghalaya, and a 30,000 plus crowd at the Dimapur stadium in Nagaland. The band was invited to India by the head of the Tripura Royal Family Maharaja Kirit Pradyot Deb Burman.
A live DVD was released on December 5, 2008 entitled ''"Bang Your Head Festival 2005"''.
!Year | !Title | !Label |
1985 | ''Fight to Survive'' | Asylum Records |
1987 | ||
1989 | ||
1991 | ''Mane Attraction'' | |
1999 | ''Remembering White Lion'' | Cleopatra Records |
2008 | ''Return of the Pride'' | Frontiers Records |
Non official websites:
Category:Glam metal musical groups Category:Heavy metal musical groups from New York Category:American hard rock musical groups Category:Musical groups established in 1983 Category:Atlantic Records artists
ca:White Lion da:White Lion de:White Lion es:White Lion fr:White Lion id:White Lion it:White Lion jv:White Lion ja:ホワイト・ライオン pt:White Lion ru:White Lion simple:White Lion fi:White Lion sv:White LionThis text is licensed under the Creative Commons CC-BY-SA License. This text was originally published on Wikipedia and was developed by the Wikipedia community.
Coordinates | 12°2′36″N77°1′42″N |
---|---|
Name | Marco Polo |
Birth place | ''c''. 1254, presumably in Venice, Italy |
Death date | January 08, 1324 |
Death place | Venice, Venetian Republic |
Resting place | Church of San Lorenzo |
Resting place coordinates | |
Known for | ''The Travels of Marco Polo'' |
Occupation | Merchant, Explorer |
Spouse | Donata Badoer |
Children | Fantina, Bellela, and Moretta |
Parents | Mother: UnknownFather: Niccolò Polo }} |
''Il Milione'' was dictated by Marco Polo to Rustichello da Pisa while both were prisoners of the Genova Republic. Rustichello translated it from Venetian Language to Tuscan dialect, subsequently embellished, copied by hand and adapted by many others; there is no authoritative version. It documents his father's journey to meet the Kublai Khan, who asked them to become ambassadors, and communicate with the pope. This led to Marco's quest, through Acre, and to the Mongol court in China. Marco apparently wrote of his extensive travels throughout Asia on behalf of the Khan, and their eventual return after 15000 miles (24000 km) and 24 years of adventures.
Their pioneering journey inspired Christopher Columbus and others. Marco Polo's other legacies include Venice Marco Polo Airport, the Marco Polo sheep, and several books and films. He also had an influence on European cartography, leading to the introduction of the Fra Mauro map.
In 1269, Niccolò and Maffeo returned to Venice, meeting Marco for the first time. In 1271, Marco Polo (at seventeen years of age), his father, and his uncle set off for Asia on the series of adventures that were later documented in Marco's book. They returned to Venice in 1295, 24 years later, with many riches and treasures. They had traveled almost .
While Polo's book describes paper money and the burning of coal, it fails to mention the Great Wall of China, chopsticks, and footbinding, making skeptics wonder if Marco Polo had really gone to China, or wrote his book based on hearsay. However, researchers note that the Great Wall familiar to us today is a Ming structure, post-dating Marco Polo's travels by more than two centuries. The Yuan rulers whom Polo served, as well as the preceding Jin and Liao Empires controlled territories both north and south of the today's wall, and would have no reasons to maintain any fortifications that may have remained there from the earlier dynasties. Other Europeans who traveled to Khanbaliq during the Yuan Dynasty, such as Giovanni de' Marignolli and Odoric of Pordenone, said nothing about the wall either.
Marco Polo was finally released from captivity in August 1299, and returned home to Venice, where his father and uncle had purchased a large house in the central quarter named ''contrada San Giovanni Crisostomo''. The company continued its activities and Marco soon became a wealthy merchant. Polo financed other expeditions, but never left Venice again. In 1300, he married Donata Badoer, the daughter of Vitale Badoer, a merchant. They had three daughters, called Fantina, Bellela and Moreta.
He divided up the rest of his assets, including several properties, between individuals, religious institutions, and every guild and fraternity to which he belonged. He also wrote-off multiple debts including 300 lire that his sister-in-law owed him, and others for the convent of San Giovanni, San Paolo of the Order of Preachers, and a cleric named Friar Benvenuto. He ordered 220 soldi be paid to Giovanni Giustiniani for his work as a notary and his prayers. The will, which was not signed by Polo, but was validated by then relevant "signum manus" rule, by which the testator only had to touch the document to make it abide to the rule of law, was dated January 9, 1324. Due to the Venetian law stating that the day ends at sunset, the exact date of Marco Polo's death cannot be determined, but it was between the sunsets of January 8 and 9, 1324.
Marco knew four languages, and the family had accumulated a great deal of knowledge and experience that was useful to Khan. It is possible that he became a government official; he wrote about many imperial visits to China's southern and eastern provinces, the far south and Burma.
Kublai Khan declined the Polos' requests to leave China. They became worried about returning home safely, believing that if Khan died, his enemies might turn against them because of their close involvement with the ruler. In 1292, Khan's great-nephew, then ruler of Persia, sent representatives to China in search of a potential wife, and they asked the Polos to accompany them, so they were permitted to return to Persia with the wedding party — which left that same year from Zaitun in southern China on a fleet of 14 junks. The party sailed to the port of Singapore, travelled north to Sumatra , sailed west to the Trincomalee port of Jaffna under Savakanmaindan and to Pandyan of Tamilakkam. Describing the Pandyan kingdom under Lord Emperor Jatavarman Sundara Pandyan I as the richest empire in existence, Polo arrived during the reign of Maravarman Kulasekara Pandyan I, son of Jatavarman Sundara Pandyan I and one of five brother kings on the continent. Eventually Polo crossed the Arabian Sea to Hormuz. The two-years voyage was a perilous one - of the six hundred people (not including the crew) in the convoy only eighteen had survived (including all three Polos). The Polos left the wedding party after reaching Hormuz and travelled overland to the port of Trebizond on the Black Sea, the present day Trabzon.
Category:Italian Roman Catholics Category:1254 births Category:1324 deaths Category:13th-century explorers Category:Expatriates in China Category:Explorers of Asia Category:Explorers of Central Asia Category:Venetian explorers Category:Venetian merchants Category:Italian travel writers Category:People from Venice (city)
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