基于星载平台的SAR实时成像处理实现方法

针对高分辨率星载SAR星上实时成像处理的工程化技术问题,提出了一种优化的实现方法。通过对成像算法流程的优化设计和计算公式的重新推导,实现了高效率的相位补偿因子计算。在此基础上,提出了一种分析和优化计算精度的方法,在保证效率的前提下提高了相位计算精度。在某型实时信号处理样机上,基于改进CS算法,实现了5米分辨率的星载SAR实时成像处理,对16384×16384原始数据的处理时间优于28秒,图像质量满足技术指标要求。

Implementation of Real-Time SAR Processing on Satellite Based Processing System

For the implementation of real-time processing of a high-resolution SAR on the satellite based processing system,an efficient approach has been presented.The efficiency is improved by the redesign of the algorithm flow,and re-deduction of a new formulation.An approach is also presented to analyze and optimize the computation precision,precision of the phase of the compensate factor is improved based on high computational efficiency.The Refined CS algorithm is implemented on a 32-bit floating-point parallel DSP processing system with the capability of processing high resolution space-borne SAR data in real-time.The processing time of an echo block(16384*16384) is less than 28 seconds,and the quality of the image meet the system requirement.