A method for the coherent integration of Fill Pulses in Pulse Doppler Radar sensors is disclosed. The present invention uses a pre- and a post-coherent waveform transmission and reception period to collect transient signals from reflections of Fill Pulses throughout the range extent. It then reassembles these signals to produce additional coherently integrable pulses of interval returns that are input to the filter and coherently integrated along with normally coherently integrated pulses. The result is an improved Signal To Noise Ratio (SNR) and Signal To Clutter Ratio (SCR) which is related to the total number of pulses emitted, including the Fill Pulses. This improvement can be obtained almost solely by signal processing in a digitally controlled Radar, and requires few if any hardware modifications.
