Abstract: A digital MTI radar system is disclosed which is adapted to reject moving clutter returns and to pass, for detection and display, returns from moving targets. The radar system includes means for producing a series of complex digital words representative of the average moving clutter Doppler velocity at each one of a series of range cells. A canceller network is provided to modify the returns from a range sweep with the complex digital words and to combine such modified returns with the returns of a successive range sweep, thereby to effectuate the desired moving clutter rejection.