窄带干扰对P波段InSAR干涉相位的影响分析

Effect analysis of narrow band interference signal on P band InSAR interferometric phase

窄带干扰信号是P频段SAR回波中常见的一类射频干扰信号,它的存在会对该频段InSAR系统的干涉相位产生严重的影响。首先推导了SAR接收的窄带干扰信号的数学模型,基于该模型通过仿真分析了窄带干扰对P波段SAR图像和InSAR干涉相位的影响。结果表明,窄带干扰的存在,使SAR图像中出现较亮的干扰条带,在这些条带处,干涉条纹被完全破坏。此外,随着干信比的增加,InSAR的相干系数在下降,干涉相位标准差在增加。分析结果对P波段InSAR系统的设计具有重要意义。

The narrow band interference （NBI） signal is one of familiar radio frequency signals in SAR operating in low frequency. The presence of narrow band interference signal has a serious influence on the interferometric phase of InSAR. The model of received narrow hand interference signal is deduced. The effect of narrow band interference on the SAR image and the interferometric phase are analyzed by simulation. The conclusions are that bright strip appears in SAR images due to the presence of NBI, and the interferometric phase in the strip is destroyed. In addition, with the increasing of ISR, InSAR coherence decreases while the standard deviation of interferometric phase increases. The analysis results are helpful to the design of InSAR system in P band.