利用地面控制点相位残差定权方法减弱InSAR轨道误差相位

doi:10.13474/j.cnki.11-2246.2019.0005

测绘通报 ›› 2019, Vol. 0 ›› Issue (1): 23-28.doi: 10.13474/j.cnki.11-2246.2019.0005

利用地面控制点相位残差定权方法减弱InSAR轨道误差相位

陈雪¹, 杨红磊¹, 彭军还¹, 费香泽², 赵斌滨², 马建国³, 宋暾昉⁴, 张午阳⁵

1. 中国地质大学(北京), 北京 100083;
2. 中国电力科学研究院, 北京 100192;
3. 国网湖北省电力有限公司, 湖北武汉 430077;
4. 国网四川省电力公司, 四川成都 610041;
5. 国网重庆市电力公司, 重庆 400015

收稿日期:2018-05-21 修回日期:2018-06-02 出版日期:2019-01-25 发布日期:2019-02-14
通讯作者: 彭军还。E-mail:pengjunhuan@163.com E-mail:pengjunhuan@163.com
作者简介:陈雪(1992-),女,博士生,主要从事InSAR数据处理与应用研究。E-mail:chenxue@cugb.edu.cn
基金资助:
国家电网公司科技项目（GCB17201700121）；国家自然科学基金青年科学基金（41304012）；国家自然科学基金仪器专项（61427802）；国家自然科学基金重点项目NSFC （41330634）；国家自然科学基金面上项目（41374016）；大地测量与地球动力学国家重点实验室基金（SKLGED2013-4-8-E）；中央高校基本科研业务费（2652015180）

A method of weight determination based on the phase residual of ground control points to mitigate phase caused by orbital error in InSAR

CHEN Xue¹, YANG Honglei¹, PENG Junhuan¹, FEI Xiangze², ZHAO Binbin², MA Jianguo³, SONG Tunfang⁴, ZHANG Wuyang⁵

1. China University of Geosciences, Beijing 100083, China;
2. China Electric Power Research Institute, Beijing 100192, China;
3. State Grid Hubei Electric Power Co. Ltd., Wuhan 430077, China;
4. State Grid Sichuan Electric Power Company, Chengdu 610041, China;
5. State Grid Chongqing Electric Power Company, Chongqing 400015, China

Received:2018-05-21 Revised:2018-06-02 Online:2019-01-25 Published:2019-02-14

摘要/Abstract

摘要： 两次SAR图像成像时卫星位置的差异导致即使在平坦地区InSAR干涉图上也会有参考面相位存在。由于定轨精度有限，InSAR数据处理过程中需去除轨道误差相位。目前常用的去除轨道误差的方法为基于轨道状态矢量计算出初始基线，再根据地面控制点信息，利用最小二乘算法得到精密基线；或将初始基线对应的参考面相位去除后，再对剩余相位进行快速傅里叶变换或曲面拟合，得到趋势性相位再去除。由于去除参考面相位在去除大气相位和获取形变相位之前，因而基线精密估计的过程中易受到大气相位和形变相位的影响，影响形变解算结果。在实际应用中发现存在干涉图在去除参考面相位后依然有趋势性相位的现象，本文针对此现象考虑大气相位和形变相位影响，提出了利用地面控制点相位残差定权的基线估计方法，提高了估计形变结果的精度，模拟试验和实际应用表明该方法具有一定的有效性和可行性。

关键词: InSAR, 轨道误差, 地面控制点, 非线性最小二乘

Abstract: There are fringes caused by baseline in the interferogram even in flat area. This phase component is reference phase. At present, the common method of removing orbit error is to calculate the initial baseline based on the orbit state vector, and then the precision baseline is obtained by using the least square algorithm according to the information of the ground control points. Alternatively, fast Fourier transform or surface fitting is applied to get rid of the trend phase which is remained after the reference phase corresponding to the initial baseline is removed. Since the reference phase is eliminated before atmospheric delay phase and the deformation phase, the precision of baseline estimation is susceptible, which may affect the accuracy of deformation. Interferogram has a trend phase component after the reference phase is removed. Therefore, in this paper, a method of weight determination based on the phase residual of ground control points is proposed to improve the accuracy of baseline estimation. Simulation experiments and practical applications show that the method is effective and feasible.

Key words: InSAR, orbital error, ground control points, nonlinear least squares

中图分类号:

陈雪, 杨红磊, 彭军还, 费香泽, 赵斌滨, 马建国, 宋暾昉, 张午阳. 利用地面控制点相位残差定权方法减弱InSAR轨道误差相位[J]. 测绘通报, 2019, 0(1): 23-28.

CHEN Xue, YANG Honglei, PENG Junhuan, FEI Xiangze, ZHAO Binbin, MA Jianguo, SONG Tunfang, ZHANG Wuyang. A method of weight determination based on the phase residual of ground control points to mitigate phase caused by orbital error in InSAR[J]. 测绘通报, 2019, 0(1): 23-28.

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利用地面控制点相位残差定权方法减弱InSAR轨道误差相位

A method of weight determination based on the phase residual of ground control points to mitigate phase caused by orbital error in InSAR

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