基于球形截断协方差矩阵的极化SAR分布式目标稳健定标方法

张晶晶; 洪文; 尹嫱

doi:10.12000/JR16138

基于球形截断协方差矩阵的极化SAR分布式目标稳健定标方法

doi: 10.12000/JR16138

1.
(中国科学院电子学研究所北京 100190)
2.
(微波成像技术国家级重点实验室北京 100190)
3.
(中国科学院大学北京 100049)
4.
(北京化工大学信息科学与技术学院北京 10029)

基金项目:

国家自然科学基金重点项目（61430118）

详细信息

作者简介:
张晶晶(1986-),男,博士研究生,研究方向为极化/混合极化SAR系统设计与定标、SAR成像算法、极化/极化干涉SAR数据处理及应用。E-mail:zhang.jingjing.1986@outlook.Com;尹嫱(1982-),女,博士,研究方向为极化干涉SAR处理及应用、散射建模与土壤湿度反演。E-mail:yinq@mail.buct.edu.cn;洪文(1968-),女,研究员,博士生导师,研究方向为雷达信号处理理论、SAR成像算法、极化/极化干涉SAR数据处理及应用、压缩感知SAR成像、圆迹SAR成像等。E-mail:whong@mail.ie.ac.cn

通讯作者:
洪文whong@mail.ie.ac.cn

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出版历程
- 收稿日期: 2016-12-02
- 修回日期: 2016-12-20
- 网络出版日期: 2016-12-28

Robust Distributed-target-based Calibration Method for Polarimetric SAR Using Spherically Truncated Covariance Matrix

1.
(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China)
2.
(National Key Laboratory of Science and Technology on Microwave Imaging, Beijing 100190, China)
3.
(University of Chinese Academy of Sciences, Beijing 100049, China)
4.
(Beijing University of Chemical Technology, Beijing 10029, China)

Funds:

The National Natural Science Foundation ofChina (61430118)

摘要

摘要: 常规的基于分布式目标的定标算法通过假设协方差矩阵满足特定形式，并用样本协方差矩阵来估计失真参数。然而，样本协方差矩阵并非稳定的协方差矩阵估计子。尤其是当场景中包含不满足定标算法要求的目标时，样本协方差矩阵会偏离理想形式，以致失真参数估计精确度下降。球形截断协方差矩阵方法能够有效地抑制离群样本对协方差矩阵估计的影响，该文将其引入到极化SAR的定标中，并对其可行性进行了理论分析。最后，利用机载全极化SAR数据，验证了该方法能够有效地降低失真参数估计的不确定度，从而提高失真参数估计的稳健性。
- 合成孔径雷达 /
- 极化 /
- 定标 /
- 球形截断协方差矩阵
Abstract: Conventional distributed-target-based polarimetric calibration algorithms estimate polarimetric distortions by assuming that the measured spatially averaged covariance matrix takes a specific form.However, when the underlying surface contains targets that do not satisfy the assumptions employed by those algorithms, the averaged covariance matrix may deviate from the desired form.As a result, poor estimates of distortion parameters may yield.It is known that spherically truncated covariance matrix is robust to outliers.Thus, we introduce it to the polarimetric SAR calibration routine.Experiment results on the airborne SAR data confirm that this method can effectively reduce the uncertainty of distortion estimates, hence improve the robustness of the calibration.
- SAR /
- Polarimetric /
- Calibration /
- Spherically truncated covariance matrix

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参考文献(15)

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