国产卫星时序InSAR形变监测精度分析

Analysis of InSAR time-series deformation monitoring accuracy of domestic satellite

陆地探测一号01组卫星(LT-1)的发射成功实现了我国L波段干涉SAR卫星“从无到有”的发展。LT-1卫星因空间避障等原因,部分空间基线较长;经过调轨后,空间基线长度控制在400 m以内。为了验证LT-1卫星数据的可用性及精度,本文以山西大同矿区为例,获取了2022年12月23日至2023年5月20日共25景LT-1条带模式影像数据,分别进行差分干涉测量短基线集时序分析(SBAS)技术和永久散射体(PS)技术数据处理。对时序InSAR和GPS站点在SAR卫星视线向上的形变监测结果进行对比分析,二者差异标准差分别为5.7 mm/a(SBAS-InSAR)和3.4 mm/a(PS-InSAR),时间序列均方根误差均小于5 mm,具有高度一致性。研究表明国产LT-1卫星具备高精度的形变监测能力,为国内地形测绘及形变监测提供了可靠的数据保障。

The successful launch of the Lutan-1 satellite group(LT-1)has achieved the development of China s L-band interferometric SAR satellite from scratch.For obstacle avoidance,a small part of the spatial baselines of LT-1 satellite was long,but the length of the baseline has been controlled to within 400 meters after the orbit adjustment.In order to verify the availability and accuracy of LT-1 satellite data,this article takes the Datong mining area in Shanxi Province as an example and obtains 25 LT-1 strip pattern image data from December 23,2022 to May 20,2023,respectively,for SBAS-InSAR and PS-InSAR data processing.By comparing and analyzing the deformation monitoring results of time-series InSAR and GPS stations in the light of sight,the standard deviations of the two are 5.7 mm/a(SBAS-InSAR)and 3.4 mm/a(PS-InSAR),respectively.The root mean square error of the time series is less than 5 mm,indicating high consistency.The research has shown that domestically produced LT-1 satellites have high-precision deformation monitoring capabilities,providing reliable data assurance for domestic terrain surveying and deformation monitoring.