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A radar detector is an electronic device used by motorists to detect if their speed is being monitored by police or law enforcement using a radar gun. Most radar detectors are used so the driver can reduce the car's speed before being ticketed for speeding. In general sense, only emitting technologies, like doppler RADAR, or LIDAR can be ...
The history of radar (where radar stands for radio detection and ranging) started with experiments by Heinrich Hertz in the late 19th century that showed that radio waves were reflected by metallic objects. This possibility was suggested in James Clerk Maxwell 's seminal work on electromagnetism.
Watson-Watt [a][5] was born in Brechin, Angus, Scotland, on 13 April 1892. He claimed to be a descendant of James Watt, the famous engineer and inventor of the practical steam engine, but no evidence of any family relationship has been found. [6] After attending Damacre Primary School and Brechin High School, [7] he was accepted at University ...
Lawrence A. "Pat" Hyland (August 26, 1897 – November 24, 1989) was an American electrical engineer.He is one of three individuals who are credited with major contributions to the invention of radar, but is probably best known as the man who transformed Hughes Aircraft from Howard Hughes' aviation "hobby shop" into one of the world's leading technology companies.
Radar is a system that uses radio waves to determine the distance (ranging), direction (azimuth and elevation angles), and radial velocity of objects relative to the site. It is a radiodetermination method [1] used to detect and track aircraft, ships, spacecraft, guided missiles, motor vehicles, map weather formations, and terrain.
Doppler effect. The emitted signal toward the car is reflected back with a variation of frequency that depends on the speed away/toward the radar (160 km/h). This is only a component of the real speed (170 km/h). The Doppler effect (or Doppler shift), named after Austrian physicist Christian Doppler who proposed it in 1842, is the difference ...
A radar speed gun, also known as a radar gun, speed gun, or speed trap gun, is a device used to measure the speed of moving objects. It is commonly used by police to check the speed of moving vehicles while conducting traffic enforcement, and in professional sports to measure speeds such as those of baseball pitches, [1] tennis serves, and ...
The Metox was manufactured by a small French company in occupied Paris. It was tuned to receive the 1.5-metre (200 MHz) signals used by many British radars of the early and mid- World War II era, notably the ASV Mk. II radar used by RAF Coastal Command to attack U-boats. It is not clear whether the design was German or French or both.