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。
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.
作者
陶明亮
李劼爽
刘艳阳
陈筠力
刘一霏
李佳旺
TAO Mingliang;LI Jieshuang;LIU Yanyang;CHEN Junli;LIU Yifei;LI Jiawang(School of Electronics and Information,Northwestern Polytechnical University,Xi'an 710072,China;Shanghai Satellite Engineering Research Institute,Shanghai 201109,China;Shanghai Academy of Spaceflight Technology,Shanghai 201109,China)
出处
《测绘学报》
EI
CSCD
北大核心
2024年第10期1896-1909,共14页
Acta Geodaetica et Cartographica Sinica
基金
国家自然科学基金(62271408)
上海航天科技创新基金(SAST2021-044)。
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
Lutan-1 satellite
L band differential interferometry
SAR
radio frequency interference
interference detection and mitigation
