地基大视场SAR形变监测的非均匀大气相位校正方法

白泽朝; 王彦平; 王振海; 胡俊; 李洋; 林赟

doi:10.12000/JR22120

地基大视场SAR形变监测的非均匀大气相位校正方法

DOI: 10.12000/JR22120

白泽朝^{1, 2},
王彦平^2, ,,
王振海³,
胡俊³,
李洋²,
林赟²

1.
北方工业大学电气与控制工程学院北京 100144
2.
北方工业大学信息学院雷达监测技术实验室北京 100144
3.
中南大学地球科学与信息物理学院长沙 410083

基金项目: 国家自然科学基金重点国际合作研究项目(61860206013)，国家重点研发计划资助(2018YFC1505103)

详细信息

作者简介:
白泽朝，博士生，主要研究方向为星载/地基InSAR技术理论和应用

王彦平，博士，教授，博士生导师，主要研究方向为雷达三维成像、地基SAR系统研制及其应用

王振海，博士生，主要研究方向为星地联合三维形变监测

胡　俊，博士，教授，博士生导师，主要研究方向为InSAR大地测量技术及其在地质灾害监测中的应用

李　洋，博士，副教授，硕士生导师，主要研究方向为极化SAR、混合极化SAR信息处理与应用

林　赟，博士，副教授，硕士生导师，主要研究方向为合成孔径雷达三维成像技术、多角度SAR图像基础理论与方法

通讯作者:
王彦平 wangyp@ncut.edu.cn

责任主编：胡程 Corresponding Editor: HU Cheng
中图分类号: TN95
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出版历程
- 收稿日期: 2022-06-22
- 修回日期: 2022-07-11
- 网络出版日期: 2022-07-28
- 刊出日期: 2023-02-28

A Non-homogenous Atmospheric Compensation Method for Deformation Monitoring of Wide-field Ground-based SAR

BAI Zechao^{1, 2},
WANG Yanping^{2
, ,},
WANG Zhenhai³,
HU Jun³,
LI Yang²,
LIN Yun²

1.
School of Electrical and Control Engineering, North China University of Technology, Beijing 100144, China
2.
Radar Monitoring Technology Laboratory, School of Information Science and Technology, North China University of Technology, Beijing 100144, China
3.
School of Geoscience and Info-physics, Central South University, Changsha 410083, China

Funds: The National Natural Science Foundation of China (61860206013), The National Key R&D Program of China (2018YFC1505103)

More Information

Corresponding author: WANG Yanping, wangyp@ncut.edu.cn

摘要

摘要: 大气变化是地基干涉合成孔径雷达(GB-InSAR)形变监测的主要干扰因素。由于监测环境的地形复杂，水汽、湿度和温度的空间异质性，基于均匀大气介质假设的校正方法可能导致大气校正精度较低。该文提出了一种两阶段半经验模型，用于估计和校正复杂大气条件下特大滑坡GB-InSAR监测过程中出现的大气相位误差。该方法兼顾线性大气相位和非线性大气相位，首先根据测区的范围和高程对观测到的大气相位进行建模，校正与地形相关的线性大气相位。然后，考虑复杂大气条件和方位向大视场角度场景下出现的空间域非均匀大气情况，选取稳定永久散射体(PS)通过插值的方式获取所有PS点的大气相位，校正非线性大气相位。采用该方法对三峡库区新铺和藕塘特大滑坡的地基大视场雷达图像进行处理，相比于常规方法减小大气相位误差最大约2 mm。能有效校正特大滑坡监测场景下出现的非均匀大气相位，满足特大滑坡广域范围监测需求。
- 地基干涉合成孔径雷达 /
- 大气相位校正 /
- 线性变化 /
- 非线性变化 /
- 稳定永久散射体
Abstract: Atmospheric influence is the main interference factor in Ground-Based Interferometric Synthetic Aperture Radar (GB-InSAR) deformation monitoring. Due to the complex terrain and various environmental factors, the correction method based on the assumption of a uniform atmospheric influence may lead to low atmospheric correction accuracy. In this paper, a two-stage semi-empirical model is proposed to correct the atmospheric phase screen during the GB-InSAR monitoring of a super large slope under complex atmospheric conditions. First, the observed atmospheric phase is modeled according to the height and range of the terrain structure to correct the linear atmospheric phase. Then, considering the complex atmospheric conditions and the spatially nonuniform atmosphere with a large azimuth field of view, stable Persistent Scatterers (PS) are selected to obtain the atmospheric phase of all PS by interpolation to correct the nonlinear atmospheric phase. This method is used to process a large field of view radar image of the foundation of the Xinpu and Outang landslides in the Three Gorges Reservoir area. Compared with the conventional method, the atmospheric phase error is reduced by approximately 2 mm. This method effectively corrects the nonuniform atmospheric phase under the landslide monitoring scene and meets the wide-area monitoring needs of the landslide.
- Ground-Based Interferometric Synthetic Aperture Radar (GB-InSAR) /
- Atmospheric phase correction /
- Linear variation /
- Nonlinear variation /
- Stable persistent scatterers

HTML全文

图 1 本文算法大气相位校正流程

Figure 1. The workflow for atmospheric phase screen processing steps

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图 2 研究区范围

Figure 2. The study area

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图 3 GB-InSAR系统

Figure 3. The GB-InSAR system

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图 4 GB-InSAR数据参数

Figure 4. GB-InSAR data parameters

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图 5 干涉对A相位

Figure 5. Interferogram A

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图 6 干涉对B相位

Figure 6. Interferogram B

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图 7 干涉对C相位

Figure 7. Interferogram C

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图 8 距离-高程校正后干涉对B相位

Figure 8. Interferogram B after distance-elevation correction

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图 9 距离-高程校正后干涉对C相位

Figure 9. Interferogram C after distance-elevation correction

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图 10 非匀质大气校正后干涉对B相位

Figure 10. Interferogram B after correcting nonlinear atmospheric

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图 11 非匀质大气校正后干涉对C相位

Figure 11. Interferogram C after correcting nonlinear atmospheric

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图 12 累计形变量

Figure 12. Cumulative deformation

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图 13 典型点变形曲线对比

Figure 13. Cumulative deformation map

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