Radar is an object which used for transmit and receive based on RF modal it has Certain frequency, Other systems similar to radar make use of other parts of the electromagnetic spectrum. Radar is an object detection system which uses radio waves to determine the range, altitude, direction, or speed of objects. It used in the to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. By the way of radar dish or antenna transmits pulses of radio waves or microwaves which bounce off any object in their path. The modern uses of radar are highly diverse, including air traffic control,Many place place the radar are used its kind of signal trans receiver. 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 such that aircraft, ships, and roads.
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, they can be strengthened by electronic amplifiers.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 the size, the wave will bounce off in a way similar to the way light is reflected by a mirror( like Eco )
Sea-based radar systems, semi-active radar homing, weather radar, military aircraft, and radar astronomy rely on the Doppler effect to enhance performance. This produces information about target velocity during the detection process. This also allows small objects to be detected in an environment containing much larger nearby slow moving objects.