SAR目标回波模拟器的设计与实现

Design and Implementation of SAR Target Echo Simulator

SAR目标回波模拟器可以真实模拟SAR信号及不同环境下的回波数据,对SAR系统的研制和其性能参数的测试起着关键作用。通常SAR回波模拟器需要对各像素点进行计算,数据量和计算量都很大。本系统设计的合成孔径雷达SAR目标回波模拟器,利用多核DSP和高性能FPGA的信号处理阵列单元,采用等距离算法,将回波位于同一距离单元的像素点信息相加后再在距离维统一乘以距离向相位信息,大大减少了回波模拟算法的计算量,最终实现的SAR回波模拟器系统带宽与运行速度都有显著提高。

SAR target echo simulator can simulate real SAR signal and echo data in different environments, which plays a key role in the development of SAR system and the test of its performance parameters. Generally, the SAR echo simulator needs to calculate every pixel, and the amount of data and calculation is very large. The SAR target echo simulator designed in this system uses the signal processing array unit of multi-core DSP and high-performance FPGA, adopts the equal distance algorithm, adds the pixel information of echo in the same distance unit, and multiplies the distance dimension by the distance phase information, which greatly reduces the calculation amount of echo simulation algorithm. Finally, the SAR echo simulator system with the width and running speed have been improved significantly.