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

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.