Seasat Synthetic-Aperture Radar Data Reduction Using Parallel Programmable Array Processors

This paper presents a digital signal processing system that produces the SEASAT synthetic-aperture radar (SAR) imagery. The system consists of a SEL 32/77 host minicomputer and three AP-120B array processors. The partitioning of the SAR processing functions and the design of softwae modules is described. The rationale for selecting the parallel array processor architecture and the methodology for developing the parallel processing scheme on this system is described. This system attains a SEASAT SAR data reduction speed of 2.5 h per 25-m resolution 4-look and 100 km X 100 km image frame. A prelininary performance evaluation of this parallel processing system and potential future applications for remote sensing data reduction are described.