A Fast Method for InSAR Phase Unwrapping Based on Quality Guide
Li Fang-fang①②④ Zhan Yi①②④ Hu Dong-hui①② Ding Chi-biao①③
①(Institute of Electronics Chinese Academy of Sciences, Beijing 100190, China) ②(Key Laboratory of Spatial Information Processing and Application System Technology, Chinese Academy of Sciences, Beijing 100190, China) ③(The National Key Laboratory of Microwave Imaging Technology, Beijing 100190, China) ④(Graduate University of Chinese Academy of Sciences, Beijing 100190, China)
Abstract：Phase unwrapping is a key issue in InSAR research. As a critical step of InSAR processing, it affects the
accuracy of interferometry measurement directly. The efficiency of the traditional quality-guided phase unwrapping method is low due to a great deal of sorting, espceically for large interferogram. This paper proposes a highly efficient quality-guided phase unwrapping method based on heap sort in order to solve the problem. First, the quality map is caculated according to the interferometric complex data or interferogram. Next, with the max-heap acting as the data structure of sorting, its property is maintained while deleting root node and inserting new node, and thus the sorting of quality map is accomplished and the phase can be unwrapped from high quality areas to low quality areas. The improved algorithm reduces the computational complexity greatly compared with traditional methods, which is significant in large area mapping of InSAR. At the end of the paper, the simulated and experimental results show the accuracy and the efficiency of the algorithm.
李芳芳, 占 毅, 胡东辉, 丁赤飚. 一种基于质量指导的InSAR 相位解缠快速实现方法[J]. 雷达学报, 2012, 1(2): 196-202.
Li Fang-fang, Zhan Yi, Hu Dong-hui, Ding Chi-biao. A Fast Method for InSAR Phase Unwrapping Based on Quality Guide. JOURNAL OF RADARS, 2012, 1(2): 196-202.
