PFA algorithm for airborne spotlight SAR imaging with nonideal motions

摘要

The nonuniform-interpolation polar format algorithm is developed of processing spotlight SAR data with nonideal platform motions. Instead of two uniform interpolations for the conventional polar format algorithm (PFA), this algorithm employs a one-dimensional uniform interpolation in the range direction and a one-dimensional nonuniform interpolation in the azimuth direction to remove effects of nonideal motion. For azimuth-nonuniform interpolation, the output sample spacing depends on the pulse number, range and motion data, and can be easily computed. The output sample spacing can also be precomputed and stored in RAM.