1. A method capable of determining the presence of a moving target behind a wall or barrier based upon a time progression images of the region of interest comprising: using ultra-wideband low frequency radar, transmitting a low frequency radar signal; receiving the low frequency radar signal from the region of interest; providing a plurality of images of the region of interest that may contain a moving target signature taken at different points in time; utilizing at least one processor, selecting a reference image from the plurality of images; forming a predetermined number of difference images of the region of interest; each difference image being formed by subtracting the absolute value of the pixels of one of the plurality of images from the absolute values of the pixels of the reference image; eliminating the negative pixel values in the predetermined number of difference images; minimizing the side lobes; and forming a combined difference image for each reference image, selecting another reference image from the plurality of images and performing the steps of forming a plurality of difference images, eliminating the negative pixel values, and minimizing the side lobes for each selected reference image to form a set of combined difference images which contain a moving target signature.