Changes

In an FMCW radar system, a chirp signal is launched into the free space using a transmit antenna. A chirp signal is an FM-modulated signal of a known stable frequency whose instantaneous frequency varies linearly over a fixed period of time (sweep time) by a modulating signal. The transmitted signal hits at the target and reflect back to a receive antenna. The frequency difference between the receive signal and the transmit signal increases with delay, and the delay is linear proportional to the range, that is the distance between the radar and the target. Echoes from the target are then mixed with the transmitted signal to produce a beat signal which will give the distance of the target after demodulation.