A 2-D Fourier Domain Algorithm for StripMap FMCW-SAR Raw Signal Simulation
条带FMCW-SAR回波数据的二维频域模拟算法

Because of small size, lightweight, inexpensive and high-resolution, recently FMCW-SAR develops rapidly and has a great prospect in the cost-effective civil applications. The system transfer function of StripMap FMCW-SAR is different from that of pulsed SAR, therefore the efficient simulation approaches for pulsed SAR could not directly be applied to FMCW-SAR. Based on the analysis of the StripMap FMCW-SAR signal characteristics, a 2-D Fourier domain algorithm of the raw signal simulation for stripmap FMCW-SAR is proposed. The proposed algorithm computes the range and azimuth integration used in time-domain simulation method efficiently by FFT technique. With respect to the time-domain simulation, the computational load is reduced by the order of O(NaNr/log2(NaNr)). The rationality and effectiveness of the presented algorithm are verified with the simulation.