Patent ID: 8912950

Claim:
A sense through the wall radar system, comprising: a main channel configured to be sensitive to targets ( 16 , 18 ) both on the near side and the far side of a barrier ( 24 ); a guard channel configured to be sensitive to targets ( 18 ) on the near side of the barrier ( 24 ), the guard channel operating at a higher frequency than the main channel; and a processing unit for combining signals from the main channel and signals from the guard channel, the system configured to: operate the main channel at a first frequency to illuminate, and receive reflections from, targets on both sides of the wall; operate the guard channel at a second frequency higher than the first frequency, to illuminate, and receive reflections from, targets on the near side of the wall; process the main channel reflections with two fast Fourier transforms to generate a main channel range-Doppler map; truncate the main channel range-Doppler map to form a truncated main channel range-Doppler map; process the guard channel reflections with two fast Fourier transforms to generate a guard channel range-Doppler map; decimate the guard channel range-Doppler map to form a decimated guard channel range-Doppler map; and suppress in the main channel targets corresponding to signals, in the decimated guard channel range-Doppler map, exceeding a threshold.