1. A system for determining a noise free image of a scene located behind a wall, comprising: a transmit antenna emits a radar pulse from different locations in front of the wall, wherein the radar pulses propagate through the wall and are reflected by the scene as echoes; a set of stationary receive antennas acquire the echoes corresponding to each pulse transmitted from each different location; a radar imaging subsystem connected to the transmit antenna and the set of receive antennas determines a noisy image of the scene for each location of the transmit antenna; a total variation denoiser denoises each noisy image to produce a corresponding denoised image; and a combiner combines incoherently the denoised images to produce the noise free image.