Description

Doppler radar systems provide information regarding the movement of targets as well as their position. When an antenna transmits pulses of radio waves, the system keeps track of the phase of the pulses. Phase refers to the shape, position and form of the pulses.

By measuring the shift (or change) in phase between a transmitted pulse and the received echo, the target's movement toward or away from the radar can be calculated. A positive phase shift implies motion toward the radar and a negative phase shift indicates motion away from the radar.

All modern radars are Doppler radars.