中文摘要：

针对超宽带探地合成孔径雷达原始回波模拟仿真速度慢的问题,提出了一种二维频域超宽带探地SAR（synthetic aperture radar）原始回波数据仿真快速算法。分析了超宽带探地SAR的信号模型,在方位时域模拟了不随距离空变的距离徙动,重新推导了超宽带探地SAR的传递函数,最后通过引入一个新的补偿函数对探地SAR的距离空变性进行了模拟。研究结果表明：将仿真结果与时域算法比较可知,该算法能够在保证回波数据高仿真精度的基础上大大提高仿真速度,计算效率提高了约O（NaNr/ln（NaNr））个数量级;该算法是一种高效的、准确的获取超宽带探地合成孔径雷达原始回波数据的方法,是研究超宽带探地SAR的重要组成部分。

英文摘要：

In order to solve the problem of slow simulation speed of UWB ground penetrating SAR raw signal, this paper proposed a two-dimensional fourier domain fast algorithm. Based on the a- nalysis of signal characteristics, this paper simulated the main range migration which caused by reference range in azimuth time-domain, decluced a new transfer function of UWB ground pene- trating SAR, and solved the range-variant problem by introducing a new compensation function. The results show that the algorithm can improve the efficiency of simulation with high precision after comparing the simulation results with time-domain algorithm. And the computational load is reduced by the order of O（NaNr/ln（NaNr））. This is an effective and accurate method in obtai- ning raw signal simulation for UWB ground penetrating SAR, which plays an important role in the study of UWB ground penetrating SAR. 2 tabs, 3 figs, 20 refs.