L波段差分干涉SAR卫星影像射频干扰分析与流程化抑制方法

doi:10.11947/j.AGCS.2024.20230272.

测绘学报 ›› 2024, Vol. 53 ›› Issue (10): 1896-1909.doi: 10.11947/j.AGCS.2024.20230272.

• 卫星重大测绘工程“陆探一号” • 上一篇

L波段差分干涉SAR卫星影像射频干扰分析与流程化抑制方法

陶明亮¹^,(), 李劼爽¹, 刘艳阳²(), 陈筠力³, 刘一霏¹, 李佳旺¹

^1.西北工业大学电子信息学院，陕西　西安　710072
^2.上海卫星工程研究所，上海　201109
^3.上海航天技术研究院，上海　201109

收稿日期:2023-07-03 发布日期:2024-11-26
通讯作者: 刘艳阳 E-mail:mltao@nwpu.edu.cn;yanyangliu0510@163.com
作者简介:陶明亮（1989—），男，博士，教授，研究方向为遥感卫星频谱管理与干扰抑制。E-mail：mltao@nwpu.edu.cn
基金资助:
国家自然科学基金(62271408);上海航天科技创新基金(SAST2021-044)

Mitigation of radio frequency interference signatures and image quality enhancement for L-band differential interferometric SAR satellite images

Mingliang TAO¹^,(), Jieshuang LI¹, Yanyang LIU²(), Junli CHEN³, Yifei LIU¹, Jiawang LI¹

^1.School of Electronics and Information, Northwestern Polytechnical University, Xi'an 710072, China
^2.Shanghai Satellite Engineering Research Institute, Shanghai 201109, China
^3.Shanghai Academy of Spaceflight Technology, Shanghai 201109, China

Received:2023-07-03 Published:2024-11-26
Contact: Yanyang LIU E-mail:mltao@nwpu.edu.cn;yanyangliu0510@163.com
About author:TAO Mingliang (1989—), male, PhD, professor, majors in frequency management and RFI mitigation. E-mail: mltao@nwpu.edu.cn
Supported by:
The National Natural Science Foundation of China(62271408);Shanghai Aerospace Science Technology Innovation Fund(SAST2021-044)

摘要/Abstract

摘要：

陆地探测一号（简称“陆探一号”，LT-1）是中国首个以陆地SAR干涉测量为核心任务的L波段差分干涉合成孔径雷达卫星，通过双星绕飞、跟飞两种工作模式，利用差分干涉形变测量和干涉测高的技术，能够全天时、全天候实现高精度地表形变监测、地形测绘等任务。LT-1卫星运行于无线电业务分配比较密集的L波段，在部分地区面临着严重的同频射频干扰影响。射频干扰会导致干涉影像质量退化、相位失真以及相干性下降，进而直接影响形变场产品反演精度，造成对地遥感观测科学数据的浪费。为了降低射频干扰的不利影响，本文系统地分析了LT-1卫星影像中的射频干扰特性，提出了针对LT-1单视复数影像的业务化、批量化射频干扰检测和抑制方法。通过大批量实测卫星影像数据验证，本文方法能够高效地抑制影像中的射频干扰，恢复提升干涉影像对的相干系数。本文方法已经成功应用于自然资源部陆探一号地面处理系统中，为卫星影像业务化形变场产品生产提供支撑保障。

关键词: 陆地探测一号卫星, L波段差分干涉, SAR, 射频干扰, 干扰检测与抑制

Abstract:

LuTan-1 (LT-1) is China's first L-band differential interferometry synthetic aperture radar (SAR) satellite with land monitoring as its core mission. It achieves high-precision, all-day, and all-weather surface deformation monitoring, and topographic mapping by twin satellites in constellation and in formation, respectively. The LT-1 satellite operates in the L-band, where radio services are relatively congested and crowded, and the resulting radio frequency interference (RFI) poses a significant challenge to accurate remote sensing. RFI will lead to image quality degradation, phase distortion, and coherence bias, which will directly affect the inversion accuracy of deformation monitoring products, resulting in the waste of scientific data of earth remote sensing observation. e. In order to mitigate the adverse effects of the interference, this paper thoroughly analyzes the radio frequency interference characteristics in LT-1 satellite images. It proposes a reliable automatic interference detection and suppression method for LT-1 single-look complex images. Experiments on massive real measured LT-1 images verify that the proposed method can effectively suppress the interference artifacts, restore and improve the interferometry coherence. This method has been successfully integrated into the ground processing system of LT-1 in the Ministry of Natural Resources, providing quality support for the application-related land monitoring products.

Key words: Lutan-1 satellite, L band differential interferometry, SAR, radio frequency interference, interference detection and mitigation

中图分类号:

P228

陶明亮, 李劼爽, 刘艳阳, 陈筠力, 刘一霏, 李佳旺. L波段差分干涉SAR卫星影像射频干扰分析与流程化抑制方法[J]. 测绘学报, 2024, 53(10): 1896-1909.

Mingliang TAO, Jieshuang LI, Yanyang LIU, Junli CHEN, Yifei LIU, Jiawang LI. Mitigation of radio frequency interference signatures and image quality enhancement for L-band differential interferometric SAR satellite images[J]. Acta Geodaetica et Cartographica Sinica, 2024, 53(10): 1896-1909.

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参考文献 21

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参数	LT-1卫星
工作频段	1215~1300 MHz
中心频率	1.26 GHz
信号带宽	80 MHz
信号PRF	1451 MHz
信号时宽	20 μs

干扰参数与指标	跟飞场景1	跟飞场景2	绕飞场景1	绕飞场景2
成像模式	STRIP2	STRIP2	STRIP1	STRIP1
信号带宽/MHz	60	80	80	80
最大干扰带宽/MHz	2.23	2.09	2.51	2.60
平均干扰带宽/MHz	0.63	0.78	1.33	0.87
方位脉冲数	29 500	27 010	64 179	33 474
存在干扰脉冲数	17 405	25 332	28 802	33 474
决定系数	0.864 9	0.918 7	0.532 9	0.270 4
抑制前平均相干系数	0.458 4	0.373 6	0.443 0	0.404 7
抑制后平均相干系数	0.479 3	0.380 2	0.538 3	0.581 9

L波段差分干涉SAR卫星影像射频干扰分析与流程化抑制方法

Mitigation of radio frequency interference signatures and image quality enhancement for L-band differential interferometric SAR satellite images

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