Radar DetectorRadar, which stands for Radio Detection and Ranging, was developed for military purposes. British and American militaries used radar to locate ships and planes. However, when using this technology, annoying signals constantly appeared on the screen. It turned out that these spots were raindrops. They saw this obstacle as a wonderful opportunity and in 1957 created the WSR-57 (Weather Monitoring, 1957), which became the weather service's primary radar for almost 40 years. This technology was later developed and used for other purposes, such as air traffic control. They use radar to track planes on the ground and in the air, and also to guide planes to smooth landings. NASA uses radar to map Earth and other aircraft, to track satellites and space debris, and to aid in tasks such as docking and maneuvering. The army uses it to detect the enemy and guide weapons. Police use a radar detector to detect the speed of passing motorists. In conclusion, radar is something that is used all around us even though it is normally invisible. When people use radar, they are generally trying to accomplish one of three things: detect the presence of an object at a distance, detect the speed of an object, or map something. These three activities can be performed simply using echo and Doppler shift. These two concepts are easy to understand because your ear hears echo and Doppler shift every day. Radar uses the same techniques using radio waves. One particular use of this radar technology is for transportation purposes. For many people, excessive speed is a part of everyday life. This circumvention of the law is so common and accepted that there is even special electronic equipment to help drivers get away with it. Since their introduction in the 1970s by Mike Churchman, radar detectors have become an essential accessory for high-speed drivers. To understand how radar detectors work, you first need to know what they detect. The concept of measuring vehicle speed is very simple. A basic speed gun is just a radio transmitter and receiver combined into one unit. A radio transmitter is a device that oscillates an electrical current so that the voltage rises and falls at a certain frequency..