1. A radar signal processing method for use with a synthetic array radar, said method comprising the steps of: operating the synthetic array radar to produce out-of-plane motion and generating radar return signals derived therefrom; processing the radar return signals to compensate for relative motion and provide motion compensated data; processing the motion compensated data to generate ground plane polar format data; processing the ground plane polar format data to generate range compressed data; processing the range compressed data to generate autofocused data; and processing the autofocused data to generate azimuth compressed data in accordance with the following steps: focusing uncompressed azimuth data for each of many discrete terrain height reference levels; compressing the focused data using a weighted Fourier transform; temporarily storing the magnitude of each pixel; outputting the largest magnitude from among all of the magnitudes for each of the terrain height reference levels for each pixel as a radar cross section value of that pixel; and outputting the reference level at which that maximum occurred as the height of that pixel.