联合干涉相位和相干性幅度的极化干涉SAR最优相干性估计

doi:10.11947/j.AGCS.2017.20150509

测绘学报 ›› 2017, Vol. 46 ›› Issue (1): 73-82.doi: 10.11947/j.AGCS.2017.20150509

联合干涉相位和相干性幅度的极化干涉SAR最优相干性估计

龙江平, 刘峰, 段祝庚

中南林业科技大学理学院, 湖南长沙 410083

收稿日期:2015-10-08 修回日期:2016-08-29 出版日期:2017-01-20 发布日期:2017-02-06
通讯作者: 刘峰 E-mail:109973184@qq.com
作者简介:龙江平(1982-),男,博士,讲师,研究方向为微波遥感和林业遥感。E-mail:longjiangping11@163.com
基金资助:
湖南省自然科学基金（2015JJ2201）；国家自然科学基金（41531068）；湖南省教育厅科学研究项目（13B153）

A New Method of Coherence Optimization Based on the Phase and Coherence Magnitude in Polarimetric SAR Interferometry

LONG Jiangping, LIU Feng, DUAN Zhugeng

College of Science, Central South University of Forestry and Technology, Changsha 410083, China

Received:2015-10-08 Revised:2016-08-29 Online:2017-01-20 Published:2017-02-06
Supported by:
Hunan Provincial Natural Science Foundation of China (No.2015JJ2201);The National Natural Science Foundation of China (No.41531068);Scientific Research Fund of Hunan Provincial Education Department (No.13B153)

摘要/Abstract

摘要： 极化干涉SAR（PolInSAR）估计的复相干性包含相干性幅度和干涉相位，相干性幅度高低可以衡量干涉相位的质量，干涉相位是散射目标相位中心位置的重要体现，相干性幅度和干涉相位估计精度决定植被参数反演精度。由不同极化状态构成的相干区域中，相干性幅度差最大和干涉相位差最大的估计准则都从复相干性的某一方面建立最优估计函数，不能有效利用相干性幅度和相位信息。本文以相干区域边界为基础，结合相干性幅度和干涉相位信息，利用关联度建立联合干涉相位和相干性幅度的最优相干性估计准则，并在相干区域范围内获取最优散射机制及其相干性。试验结果表明，联合干涉相位和相干性幅度的最优估计准则可以有效区分地表散射和森林冠层散射的相干性和散射中心，提高植被高反演的可靠性。

关键词: PolInSAR, 极化状态, 最优相干性, 相干区域, 关联度

Abstract: The complex coherence of polarimetric synthetic aperture radar interferometry (PolInSAR) includes the magnitude and phase. The magnitude of coherence is used to measure the quality of the interference phase, and phase center represents the position of the scattering. So, how to improve the accuracy of the coherence magnitude and phase is very important for the forest parameters inversion. Maximum difference of the coherence magnitude or maximum separation of the phase, based on the coherence region, is considered partial information of the complex coherence. In this paper, a new method of coherence optimization, combined with the coherence magnitude and phase information, is established with relational degree. Applied the new approach to estimate the optimal coherence, the optimal polarimetric state of the scattering can be obtained to estimate the optimization coherence. Experimental results show that the optimal coherence criterion, jointed coherence magnitude and phase, can effectively distinguish the phase center of surface scattering and the forest canopy, and improve the reliability of the forest height inversion.

Key words: PolInSAR, polarimetric state, optimal coherence, coherence region, relational degree

中图分类号:

P237.3

龙江平, 刘峰, 段祝庚. 联合干涉相位和相干性幅度的极化干涉SAR最优相干性估计[J]. 测绘学报, 2017, 46(1): 73-82.

LONG Jiangping, LIU Feng, DUAN Zhugeng. A New Method of Coherence Optimization Based on the Phase and Coherence Magnitude in Polarimetric SAR Interferometry[J]. Acta Geodaetica et Cartographica Sinica, 2017, 46(1): 73-82.

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联合干涉相位和相干性幅度的极化干涉SAR最优相干性估计

A New Method of Coherence Optimization Based on the Phase and Coherence Magnitude in Polarimetric SAR Interferometry

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