基于多核DSP的SAR数据并行访问研究  

Research on multi-core DSP based parallel access for SAR data

作　　者：周峰 李健[1] ZHOU Feng;LI Jian(The 32th Research Institute of China Electronics Technology Group Corporation,Shanghai 201808,China)

机构地区：[1]中国电子科技集团公司第三十二研究所,上海201808

出　　处：《现代电子技术》2018年第15期26-30,共5页Modern Electronics Technique

基　　金：核高基国家科技重大专项(2017ZX01041201);中国电科十三五雷达技改项目(2017ZC72006)~~

摘　　要：合成孔径雷达(SAR)数据处理中的一个重要操作是分别访问存储器中的距离向和方位向数据,当前在Keystone多核DSP平台上主要使用单个核或EDMA访问SAR数据,但很多情形下无法充分利用存储器的带宽。针对该问题,结合EDMA,DDR存储器等外设的硬件特性,提出一种适用于多核DSP的SAR数据分块映射存储方法及行切换开销最优的并行访问技术,并给出应用并行访问模式的一个充分条件。测试结果表明,分块映射存储方法能均衡距离向和方位向数据的访问速度,且更能充分地利用存储器带宽,提高数据的访问效率。One of the important operations during SAR(synthetic aperture radar)data processing is to access the range direction and azimuth data stored in the memory.The method of single core or EDMA is mainly used to access the SAR data on Keystone multi.core DSP platform,but the memory bandwidth couldn′t be taken full advantage in many cases.For the above problem,the hardware features of EDMA,DDR and other peripherals are combined to propose a SAR data block mapping storage method suitable for multi.core DSP,and a parallel access technology for optimal row switch overhead.A sufficient condition for parallel access mode is given.The test results show that the block mapping storage method can balance the access speed of range direction and azimuth data,utilize the memory bandwidth more effectively,and improve the data access efficiency.

关 键 词：多核DSP 并行访问 信号处理 矩阵转置 合成孔径雷达 分块映射 

分 类 号：TN957.52-34[电子电信—信号与信息处理]