COHERENT OSCILLATOR

A coherent oscillator circuit which samples a signal responsive to phase and frequency of a transmitted pulse of radio frequency energy in an acquisition mode, and regenerates a signal corresponding to the sampled phase and frequency in a save mode is disclosed. A storage element performs the sampling in a relative fast, open loop manner during the acquiring mode. Then, during the save mode a phase locked loop forms which locks when a loop oscillator outputs a signal which corresponds to the sampled signal. The coherent oscillator forms a portion of a demodulator for a coherent-on-receive radar.