1. A radar on a moving platform for target recognition of a target on a sloping terrain having a slope, said target illuminated from a plurality of aspect angles by said radar on said moving platform, said radar on said moving platform positioned at a low grazing angle with respect to said target for generating a shadow of said target on said sloping terrain for each aspect angle of said plurality of aspect angles, said radar comprising: analog to digital converter for converting reflections induced by said illumination from said target into target digital data and for converting reflections induced by said illumination from said sloping terrain into terrain digital data; a computer for: extracting radar images of said target and said shadow of said target at said plurality of aspect angles from said target digital data acquired at said low grazing angles; computing said slope of said sloping terrain from said terrain digital data; correlating a plurality of said radar images to compute a three dimensional image of said target from said shadow of said target upon said sloping terrain and said slope of said sloping terrain; classifying said three dimensional image for target recognition using a target recognition algorithm.