1. The method for detecting an agitated, reflective substantially stationary target comprising the steps of radiating an interrogation wave of radio frequency energy, receiving a reflected energy signal from the substantially stationary target, and mixing said received reflected signal with a local oscillation comprising a replica of the frequency of the radiated wave to extract a band limited portion of said reflected signal in a fixed, predetermined frequency band adjacent to and not including the frequency after mixing of said radiated wave and any Doppler frequency shifted reflected wave generated by relative motion between the interrogation wave emitting source and the target.