扩展场景的双基地SAR快速回波仿真算法

Fast Raw Signal Simulation Algorithm for Bistatic SAR with Extended Scenes

针对收发平台等速平飞的双基地合成孔径雷达条带工作模式,提出了一种用于扩展场景原始回波生成的频域快速仿真算法。为保证回波相位的准确性,频域传递函数及空变相位误差项均通过数值计算得到,由于回波信号的计算主要基于快速傅立叶变换实现,因此算法具有高的计算效率。最后利用单基地合成孔径雷达的实际图像作为扩展场景数据仿真了双基地SAR回波信号,成像结果分析验证了算法的有效性。

For bistatic synthetic aperture radar （BiSAR） work mode with parallel flight path and same velocity of transmitter and receiver platform, a fast raw signal simulation algorithm for extended scenes was proposed. The exact transfer function and space variant phase error items were numerically computed in order to maintain the phase precision. The algorithm has high computation efficiency by using FFT. Through using real monostatic SAR raw image data, the raw signal of BiSAR was simulated, and the algorithm was validated through analyzing imaging results.