The principle of synthetic aperture radar (SAR) image formation is reviewed in preparation for a discussion of both optical and digital processing techniques. The tilted-plane optical processing approach is presented as being representative of optical techniques. Since the newer digital approaches can take several forms, three classes of digital processors are examined: direct convolution, frequency multiplexing, and frequency analysis of dechirped data. A subjective listing of the relative merits for both processing media is presented. Both are found to be technically viable. The final choice will depend primarily upon the application requirements.
Dale A. Ausherman,
"Digital Versus Optical Techniques In Synthetic Aperture Radar (SAR) Data Processing," Optical Engineering 19(2), 192157 (1 April 1980). https://doi.org/10.1117/12.7972488