回波仿真是进行合成孔径雷达 (SAR)研究的重要途径，但其计算量巨大，所需的时间较长。为了快速实现合成孔径雷达回波仿真，采用现场可编程门阵列 (FPGA)作为主处理芯片，设计了专用于 SAR回波信号模拟的实时数字信号处理板卡，并在板卡上编程实现整个回波模拟算法。实际应用结果显示，采用 FPGA来实现 SAR回波仿真，可以在保证精确度的前提下，大大加快仿真速度。

The echo simulator is of great significance to the research on Synthetic Aperture Radar (SAR), whereas it costs massive computation. In order to realize fast simulation of SAR echo, the Field Programmable Gate Array(FPGA) is adopted as the kernel chirp to design the digital signal processing board specially used in SAR echo simulation. The simulation algorithm is realized on the board by programming. The application result shows that the realization of SAR echo simulator based on FPGA can greatly accelerate the simulation speed and significantly reduce energy consumption.