射频干扰对机载P波段重复轨道InSAR系统的影响分析  

Analysis of the Effect of Radio Frequency Interference on Repeat Track Airborne InSAR System

作　　者：丁斌[1,2] 向茂生[1] 梁兴东[1] 

机构地区：[1]中国科学院电子学研究所,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《雷达学报（中英文）》2012年第1期82-90,共9页Journal of Radars

基　　金：国家863计划项目(2007AA120303);国家973项目(2009CB724003)资助课题

摘　　要：工作在低频段的SAR容易受到射频干扰(Radio Frequency Interference,RFI)的影响,而导致SAR图像质量的恶化。对于重复轨道InSAR来说,RFI的存在还会影响其干涉相位。针对此问题,该文将实测RFI信号加入仿真的典型圆锥场景回波,进行成像和干涉处理,给出了干扰前后的成像和干涉处理结果,分析了实测RFI对SAR图像幅度、相位和重复轨道干涉处理的影响。最后使用频域陷波方法对机载P波段重复轨道InSAR实际数据中的RFI信号进行干扰抑制,给出了干扰抑制前后的重复轨道干涉处理结果,验证了仿真分析的正确性,表明了该文干扰抑制方法对减小由RFI引入干涉相位误差的有效性。The SAR system operating at low frequency is susceptible to Radio Frequency Interference （RFI） from television station, radio station, and some other civil electronic facilities. The presence of RFI degrades the SAR image quality, and obscures the targets in the scene. Furthermore, RFI can cause interferometric phase error in repeat track InSAR system. In order to analyze the effect of RFI on interferometric phase of InSAR, real measured RFI signal are added on cone simulated SAR echoes. The imaging and interferometric processing results of both the RFI-contaminated and raw data are given. The effect of real measured RFI signal on repeat track InSAR system is analyzed. Finally, the imaging and interferometric processing results of both with and without RFI suppressed of the P band airborne repeat track InSAR real data are presented, which demonstrates the efficiency of the RFI suppression method in terms of decreasing the interferometric phase errors caused by RFI.

关 键 词：射频干扰 干涉合成孔径雷达 合成孔径雷达 干涉相位 重复轨道 

分 类 号：TN974[电子电信—信号与信息处理]