联合实、复相关函数的干涉SAR图像配准方法

摘要

SAR image coregistration is one of the key steps in InSAR data processing, while the coregistration accuracy can directly affect the quality of follow-up products. A method for lnSAR image coregistration based on integrating real and complex correlation function is presented. Firstly, based on the analysis of characteristics of the existing coregistration measure function ,and with international SAR data processing experience, it＇s concluded that a robust, universal tnSAR image ceregistration method should take correlation function as its coregistration measure function. Secondly, for the correlation function have two of real and complex correlation calculations, the author analyzed the characteristics and the adaptation of real and complex correlation function, and put forward the concept of coregistration sensitive factor, which can be effectively and adaptively select the appropriate correlation function, Finally, the implementation steps of the coregistration algorithm are given in detail. And the real data processing results show the effectiveness of the proposed coregistration method.%SAR复图像配准是干涉SAR数据处理中的关键步骤之一，配准精度直接影响后续产品的质量。提出一种基于联合实、复相关函数的星载干涉SAR图像配准方法。首先，在分析已有配准测度函数各自特性的基础上，结合国际上干涉SAR数据处理经验，认为在全球干涉测量任务背景下，相关函数是一种稳健、普适性的干涉SAR图像配准测度函数。然后，针对相关函数存在实、复相关计算，分析实、复相关函数各自的特点以及适应情况，提出配准灵敏度准则，从而能够有效地自适应地选取相应的配准相关度量。最后，给出配准算法的详细实现步骤。复杂地区的实测数据处理结果验证了方法的有效性。