Radar and Electronic Countermeasures
RADAR is an acronym which stands for Radio Detection and Ranging. The basic concept is that a pulsed electromagnetic wave of known power and frequency is transmitted in a specific direction where it encounters a target that reflects some portion of the signal back, which is measured by a receiving device. Radars can use CW signals, basic pulses and a wide variety of other signal waveforms.
In addition to range, other information about the target can be detected, such as speed and direction, by varying parameters of the radar system. For example, scanning an area with a highly directive antenna can provide the direction of the target in azimuth and elevation, while measuring the frequency shift of the received signal can provide the target’s speed.