利用海潮模型研究D-InSAR中的海潮负荷效应  

Using Ocean Tide Model to Study the Ocean Tide Load Effect in D-InSAR

作　　者：欧阳亿 王琪洁[1,2] 魏国光 OUYANG Yi;WANG Qijie;WEI Guoguang(School of Geosciences and Info-Physics,Central South University,Changsha 410083,China;Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of Education,Central South University,Changsha 410083,China)

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410083 [2]中南大学有色金属成矿预测与地质环境监测教育部重点实验室,湖南长沙410083

出　　处：《测绘地理信息》2022年第2期39-44,共6页Journal of Geomatics

基　　金：洞庭湖区生态环境遥感监测湖南省重点实验室(DTH Key Lab.2021-010)。

摘　　要：海潮负荷位移在沿海区域的相对形变可达数厘米,所以在沿海区域使用差分干涉合成孔径雷达(differential interferometric synthetic aperture radar,D-InSAR)测量微小形变时,须考虑海潮负荷影响。本文利用美国南加州8个验潮站的潮高数据,对两个全球海潮模型FES2004、HAMTIDE11A和一个区域海潮模型osu.usawest.2010进行精度评估;根据评估结果选取合适的组合模型,并计算美国南加州沿海区域的D-InSAR中的海潮负荷效应,然后将其与GPS观测值对比分析。结果表明:在计算海潮负荷位移时,组合模型的精度高于全球海潮模型;组合模型计算值和GPS估计值在雷达视线方向(line of sight,LOS)的位移趋势相互一致,且都达到了厘米级。The relative deformation of the ocean tide load displacement in the coastal area can reach several centimeters.Therefore,when measuring the small deformation in the coastal area by the differential interference synthetic aperture radar(D-InSAR),the influence of the ocean tide load must be considered.This paper uses the tide height data of eight tide stations in Southern California to evaluate the accuracy of two global tide models FES2004,HAMTIDE11A and a regional tide model osu.usawest.2010;then selects the appropriate combination model based on the evaluation results,calculates the tidal load effect in D-InSAR in the coastal area of Southern California and compares it with GPS observations.The results show that the accuracy of the combined model is higher than that of the global ocean tide model when the displacements of the ocean tide load are calculated,that the displacement trend of the combined model and GPS estimates in the radar line of sight(LOS)is consistent with each other,and both reach the centimeter level.

关 键 词：海潮模型 GPS精密单点定位 海潮负荷效应 D-INSAR 雷达视线方向 

分 类 号：P229[天文地球—大地测量学与测量工程]