Using ADSP21062 based hgh-speed signal processing system to implement azimuth processing of real-time imager for airborne SAR

Real-time Imager can provide Synthetic Aperture Radar(SAR) image in real-time mode which is significant for airborne SAR applications such as real-time monitoring and battle reconnaissance. A SAR real-time imager usually implements SAR imaging algorithms with high-speed DSP system. This paper describes a high-speed DSP system based on ADSP21062 to realize azimuth processing with range-Doppler algorithm, consisting of range migration correction and azimuth compression. 8 ADSP21062s are organized in 4 parallel processing blocks in this system achieving a processing speed of 960MFLOP. Elaborate software programming ensures a high efficient utilization of hardware. Experimental simulation and field flight indicate this system is successful. The principle architecture, hardware implementation and software design are presented in this paper in details.