Pulse-Doppler is a 4D radar system capable of detecting both target 3D location as well as measuring radial velocity (range-rate). It uses the Doppler effect to resolve the relative velocity of objects; pulses of RF energy returning from the target are filtered to measure the phase shift between successive target reflections returning from successive transmit pulses. Pulse-Doppler radar is used in many applications. It is crucial for military applications because it will reliably detect very small rapidly moving objects hidden by large slow moving objects...