Airborne Pulse-Doppler Radar

Doppler radars are employed for the detection of moving targets whose radar echo area is much smaller than the ground clutter return. Moving targets are separated from clutter on a frequency basis by utilizing the Doppler phenomenon. Continuous-wave Doppler radars have a practical maximum-range capability because the leak-through between the transmitter and receiver causes receiver saturation. This limitation is overcome in pulse-Doppler radar by time-sharing the transmitting and receiving cycles. This paper discusses a typical pulse-Doppler radar and the basic design considerations for the selection of the pulse-recurrence fre-frequency, elimination of clutter, range determination, and oscillator stability requirements.