Abstract
This paper concerns a digital signal processing system for the SEASAT-SAR imagery developed by the Radio Research Laboratories. The system consists of two major parts, those are the host minicomputer and the array processor. High speed processing of SEASAT-SAR imagery is realized by means of following techniques ; (1) Data transfer between the host mini-computer and the external memory, calculation in the host mini-computer, and that in the array processor are performed at the same time, and (2) Doppler FM rate of the echoes are approximated by the third-oder polynominal with respect to the range pixel number to reduce an amount of autofocusing process. This system attains the speed of approximately 5 hours to produce a SEASAT-SAR image of 34 km x 60 km using 4-look overlay.
