A Reflection Symmetry Approximation of Multilook Polarimetric SAR Data and its Application to Freeman-Durden Decomposition

被引:35
|
作者
An, Wentao [1 ]
Lin, Mingsen [1 ]
机构
[1] Natl Satellite Ocean Applicat Serv, Dept Systemat Engn, Beijing 100081, Peoples R China
来源
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 2019年 / 57卷 / 06期
关键词
Polarimetric decomposition; Polarimetric Synthetic Aperture Radar (POLSAR); radar polarimetry; MODEL-BASED DECOMPOSITION; SCATTERING POWER DECOMPOSITION; COHERENCY MATRIX; UNITARY TRANSFORMATION; THEOREMS;
D O I
10.1109/TGRS.2018.2886386
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Freeman-Durden decomposition is a frequently used technique to analyze the scattering characteristics of multilook Polarimetric Synthetic Aperture Radar (POLSAR) data. When it is applied to the real POLSAR data, two problems emerge, namely, the volume scattering overestimation and negative powers. Many researchers think these two problems are caused by the insufficient decomposition algorithm, and several improvements are proposed. However, the improved decomposition algorithms become more and more complicated, and some new problems such as the decomposed component is not model based also emerge. In this paper, we try to solve the two problems through another way. We think they are caused not by the insufficient decomposition algorithm but by the dogmatic input. Freeman-Durden decomposition explicitly assumes reflection symmetry. Its input is a direct truncation of the measured coherency matrix. The truncation can be regarded as a reflection symmetry approximation (RSA) of the measured coherency matrix. We first show some reasons why we do not think the truncation is a good RSA. Then, a new RSA is proposed based on the sum of three reflection symmetry components derived from the measured coherency matrix. Experimental results with several real POLSAR images show that, if the new RSA is used as the input of Freeman-Durden decomposition, the above-mentioned two problems no longer exist.
引用
收藏
页码:3649 / 3660
页数:12
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