基于运动误差的机载SAR回波模拟方法  

Raw Signal Simulation of Airborne SAR Based on Trajectory Deviations

作　　者：杨志强[1,2] 郭巍[1] 王岩飞[1] 

机构地区：[1]中国科学院电子学研究所,北京100080 [2]北京无线电计量测试研究所,北京100854

出　　处：《数据采集与处理》2009年第2期170-174,共5页Journal of Data Acquisition and Processing

摘　　要：对存在轨迹运动误差的机载合成孔径雷达(SAR)回波信号进行了频域分析,指出在存在运动误差的情况下,传统的二维频域模拟方法不能直接使用。为了有效地模拟SAR回波,本文给出了一种适合机载SAR系统的回波模拟方法。该方法首先在时域计算理想轨迹下的SAR系统传递函数,然后在方位向频域加入运动误差并与场景后向散射系数相乘,最后在距离向时域进行积分得到二维回波信号。该方法的约束条件对于机载SAR系统比较合理,而且计算效率远高于时域模拟方法,可以进行分布场景的模拟。仿真结果证明了该方法的有效性。By analyzing the airborne SAR raw signal in Fourier domain, it is pointed out that the 2-D Fourier domain SAR raw data simulation cannot be used in airborne case. To overcome this limitation, a raw signal simulation for airborne SAP, system is proposed. Firstly, the approach evaluates the standard SAR transfer function under the nominal trajectory in time-domain. Then, the motion deviations multiply backscattering coefficient in azimuth Fourier-domain. Finally, the 2-D raw signals by range time-domain integration are obtained. It is also demonstrated that the assumption is reasonable and the approach is much more efficient than the time-domain one. Simulation results prove the effectiveness of the approach.

关 键 词：合成孔径雷达 回波模拟 轨迹运动误差 

分 类 号：TN957[电子电信—信号与信息处理]