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A Massively Parallel Spotlight Synthetic Aperture Radar Digital Processor

A spotlight synthetic aperture radar digital processor has been implemented on an nCUBE 2 parallel supercomputer at Sandia National Laboratories. The digital processor consists of three principal components: a polar reformatter, a two-dimensional fast Fourier transformation code, including Taylor weighting [1] for side-lobe reduction, and a phase gradient autofocus [2] code. Several components of the digital processor have also been implemented on other parallel computers including a CM-2, an Intel iPSC/860 , and a Cray Y-MP/1. The performance of the radar processor on all of these machines is discussed.