步进线性调频脉冲串SAR实时成像算法在多DSP平台上实现的研究  

Research and Realization of Real-Time Parallel Processing of SAR LFM Burst Algorithm on Multi-DSP Platform

作　　者：张晓斌[1,2] 莫志锋[1] 王贞松[1] 

机构地区：[1]中国科学院计算技术研究所 [2]中国科学院研究生院,北京100039

出　　处：《小型微型计算机系统》2006年第12期2352-2357,共6页Journal of Chinese Computer Systems

基　　金：机载合成孔径雷达实时成像试飞项目资助

摘　　要：SAR的步进线性调频脉冲串(LMFBurst)工作模式是一种通过多子脉冲合成提高距离向分辨率的新的SAR成像模式,其算法流程中包含较多的FFT/IFFT处理,算法的结构性变差,不利于实时处理.本文通过分析步进线性调频脉冲串算法本身的特点,提出了一种显著减少FFT/IFFT处理次数的优化方法;并结合使用的存储器芯片性能,提出了一种提高系统访存效率的存储结构优化方法;最后在一种多DSP处理平台上做了并行流程的设计与实现.The linear frequency modulated burst pulses （LFM burst） mode of SAR system is a new operating mode developed to improve SAR imager s range resolution, whose basic principle is to compound the multi-subpulse in range direction. This processing procedure comprises many FFT/IFFT operations, which do not have a nice structure and are not suitable for real-time processing. This paper proposes a new method that incorporates fdc shifting operation into the azimuth compressing operation to remarkably reduce FFT/IFFT numbers. In addition, this paper provides a method that organizes the raw array data in diagonal mode to enhance the memory access efficiency. Finally, the paper designs and realizes the parallel processing of LMF burst algorithm on a multi-DSP platform.

关 键 词：线性调频脉冲串 算法结构 存储结构 并行处理 

分 类 号：TP75[自动化与计算机技术—检测技术与自动化装置] TP302[自动化与计算机技术—控制科学与工程]