天绘二号双星InSAR成像与DSM生成技术

doi:10.11947/j.AGCS.2022.20210323

测绘学报 ›› 2022, Vol. 51 ›› Issue (12): 2493-2500.doi: 10.11947/j.AGCS.2022.20210323

• 天绘二号卫星系列专栏 • 上一篇下一篇

天绘二号双星InSAR成像与DSM生成技术

向建冰^1,2,3, 吕孝雷^1,2,3, 付希凯^1,3, 薛飞扬^1,2,3, 云烨^1,3, 叶宇⁴, 何可⁴

1. 中国科学院空天信息创新研究院, 北京 100194;
2. 中国科学院大学电子电气与通信工程学院, 北京 100049;
3. 中国科学院空天信息创新研究院空间信息处理与应用系统技术重点实验室, 北京 100190;
4. 中国资源卫星应用中心, 北京 100094

收稿日期:2021-06-08 修回日期:2022-10-25 发布日期:2023-01-12
通讯作者: 吕孝雷 E-mail:academism2017@sina.com
作者简介:向建冰(1995-),男,博士生,研究方向为星载SAR成像,InSAR处理,雷达动目标检测。E-mail:xiangjianbing17@mails.ucas.edu.cn
基金资助:
星载双基SAR数据处理项目(E0H2080702)

Bistatic InSAR interferometry imaging and DSM generation for TH-2

XIANG Jianbing^1,2,3, Lü Xiaolei^1,2,3, FU Xikai^1,3, XUE Feiyang^1,2,3, YUN Ye^1,3, YE Yu⁴, HE Ke⁴

1. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100194, China;
2. School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
3. Key Laboratory of Technology in Geo-Spatial Information Processing and Application Systems, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China;
4. China Center for Resources Satellite Data and Application, Beijing 100094, China

Received:2021-06-08 Revised:2022-10-25 Published:2023-01-12
Supported by:
Spaceborne Bistatic SAR Data Processing Program (No.E0H2080702)

摘要/Abstract

摘要： 天绘二号是编队飞行的双卫星合成孔径雷达系统,相比于传统InSAR系统,它能够消除时间和大气等去相干源,产生高相干性的SAR图像对。本文首先阐述了基于双曲等效的双星干涉扩展线性调频变标(extended chirp scaling, ECS)成像处理算法,并引入预滤波处理混合基线带来的相干性降低和干涉相位误差等问题。然后介绍了双星模式下干涉处理方法和三维重建的技术流程。最后用天绘二号某试验场山地区域的原始回波数据进行了干涉成像试验,并用生成的SAR图像对进行三维重建,分析了图像的相干性,相位解缠结果与DSM重建结果。试验结果验证了本文的干涉成像算法具有良好聚焦性和保相性,同时验证了数据的干涉测量和三维重建能力。

关键词: 合成孔径雷达干涉成像, 干涉处理, DSM生成

Abstract: TH-2 is a bistatic synthetic aperture radar (SAR) satellite system in formation flight. Compared with traditional InSAR systems, it can eliminate decoherent sources such as time and atmosphere, besides, it can generate highly coherent SAR image pairs. This paper firstly describe the extended chirp scaling (ECS) imaging algorithm based on the hyperbolic equivalent method, and also introduces pre-filtering to deal with problems such as reduced coherence and interference phase errors caused by mixed baselines. Secondly, it introduces the interference processing method and the technical process of DSM reconstruction in the bistatic mode. Finally, an interference imaging experiment is performed using the original echo data of a certain mountainous experimental area, and the 3D reconstruction experiment is performed by using the generated SAR image pair, which analyzes the coherence of the image, the phase unwrapping results and the DSM reconstruction results. The experimental results verify that the interference imaging algorithm in this paper has good focusing effect and phase preservation capacity. At the same time, the interferometry and 3D reconstruction capabilities of the data are verified as well.

Key words: SAR interferometric imaging, InSAR process, DSM generation

中图分类号:

TN958
P236

向建冰, 吕孝雷, 付希凯, 薛飞扬, 云烨, 叶宇, 何可. 天绘二号双星InSAR成像与DSM生成技术[J]. 测绘学报, 2022, 51(12): 2493-2500.

XIANG Jianbing, Lü Xiaolei, FU Xikai, XUE Feiyang, YUN Ye, YE Yu, HE Ke. Bistatic InSAR interferometry imaging and DSM generation for TH-2[J]. Acta Geodaetica et Cartographica Sinica, 2022, 51(12): 2493-2500.

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天绘二号双星InSAR成像与DSM生成技术

Bistatic InSAR interferometry imaging and DSM generation for TH-2

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