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

doi:10.11947/j.AGCS.2024.20230272.

Abstract

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

CLC Number:

P228

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