最大相干波束同步方法及其性能验证研究

波束同步是分布式InSAR系统的关键技术之一.本文提出一种基于最大相干系数的星载分布式InSAR系统波束同步方法.分析了该波束同步方法下,双站多普勒中心频率的计算方法及双站图像信噪比的损失.进而从干涉图像对去相干、干涉处理中的独立视数以及干涉时刻配准误差的影响几个方面指出该方法相对于传统波束同步方法的优势,并进行了InSAR全流程信号级仿真验证.仿真结果表明,该方法可以有效提高分布式InSAR系统的测高定位精度.

Maximum Coherence Illumination Synchronization Method and its Performance Verification

Illumination synchronization is the key technology for distributed interferometric SAR systems.A novel illumination synchronization method based on the maximum coherence is proposed.Then,the Doppler centroid frequency and the image SNR loss of bistatic mode SAR are analyzed theoretically.The advantages of the method compared with the traditional illumination synchronization method are presented by analyzing the effect of the interferometric image pair coherence、the number of independent looks for interferometric phase estimation and the error of interferometric coregistration time.A simulation which contains full process of InSAS system is carried out,The simulation results indicate that this method can improve the interferometric performance of the distributed InSAR system effectively.