无网格算法在相位展开中的应用  

Application of mesh-less method in phase unwrapping

作　　者：曲小宁[1] 冯大政[1] 张妍[1] 薛海伟[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《系统工程与电子技术》2012年第3期472-476,共5页Systems Engineering and Electronics

基　　金：国家自然科学基金(60971111)资助课题

摘　　要：缠绕相位的展开是分析干涉合成孔径雷达数据的关键步骤,提出了一种利用无网格法进行相位展开的算法。该算法首先通过径向点插值无网格法计算出相位在划定支持域内的近似函数,然后在最小二乘意义下通过计算待展开相位点在支持域范围内的局部最佳近似值进行相位展开。由于结合了最小二乘法和无网格法的优点,该方法对于干涉图中质量较低区域同样可以进行有效相位展开,同时在很大程度上防止了误差的传递。最后通过仿真数据及实测数据验证了该算法的有效性。Phase unwrapping is a key step in the analysis of interferometric synthetic aperture radar（InSAR） data.An InSAR phase unwrapping algorithm based on the mesh-less method is proposed.Firstly the algorithm generates a mesh-less function by the point interpolation method,and then under least square theory,phase unwrapping is implemented through estimating the local best approximate value at the domain.Combining with the advantages of both least square method and mesh-less method,the proposed algorithm can unwrap the part of unreliable regions in an interferogram effectively,and it can also avoid error propagation to a great extent.Finally,the effectiveness of the algorithm is verified by simulation data and real data.

关 键 词：干涉合成孔径雷达 相位展开 无网格法 最小二乘法 

分 类 号：TN957[电子电信—信号与信息处理]