COHO

COHO, short for Coherent Oscillator, is a technique used with radar systems based on the cavity magnetron to allow them to implement a moving target indicator display. Because the signals are only coherent when received, not transmitted, the concept is also sometimes known as coherent on receive. Due to the way the signal is processed, radars using this technique are known as pseudo-coherent radar.

COHO can be inexpensively implemented in analog electronics and was widely used in the 1950s into the 1970s. As newer solid-state systems and fully digital processing became inexpensive, COHO became less widely used and is today found only on certain low-cost systems.