Abstract:

Back projection (BP) imaging algorithm, whose low efficiency reduces its applications in practical projects, could be applied in nonuniform apertures. According to this, many scholars have presented some fast back projection (FBP) algorithms based on the subaperture method. But how to compensate the motion error after subaperture dividing is awaited for further studying. The motion compensation method for FBP algorithm at different motion error levels is studied. Three situations denoting different motion error levels, which are only nonuniform azimuth aperture, tracks of twodimensional motion error and highly nonlinear even curvilinear flight tracks, are discussed. Then an FBP projection imaging algorithm for arbitrary aperture is given, and this algorithm needs highly precise position information. Finally, an outside experiment is made to prove the algorithm’s availability.