基于FPGA的多模式SAR预处理系统设计与实现

Design and Realization of Multimode SAR Preprocessing System Based on FPGA

为适应多模式SAR(SyntheticApertureRadar)系统的预处理需要,在传统预处理器基础上设计了基于FPGA的具有多种工作模式的预处理系统。该系统包括数据存储,FIR滤波器和降采样等,可通过发送ISA控制信号在三种工作模式中进行实时切换。设计采用了Xilinx公司的VirtexII系列芯片,作为预处理核心部分的FIR滤波器采用了并行分布式算法,提高了处理速度。仿真结果表明,电路工作正确可靠,能满足设计要求。

As for the preprocessing requirements of the multimode SAR, we proposed a FPGA based preprocessing system, and accomplished it by using the Xilinx Virtex-Ⅱ devices. It consists of data storage, FIR filter and downsample circuit. It can switch in three modes in real time according to the ISA control signal. FIR is the core of the system, by adopting parallel distributed arithmetic, the speed of the system can be improved significantly. The simulation results on the hardware circuit prove that this method is efficient and can meet the design requirements very well.