海洋潮汐负荷对精密单点定位的影响研究  

Study on the influence of ocean tidal load on precise point positioning

作　　者：李艳红 成芳[1,2] 沈朋礼[1,2,3] 肖厦 LI Yanhong;CHENG Fang;SHEN Pengli;XIAO Xia(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;Key Laboratory of Precise Positioning and Timing Technology,Chinese Academy of Sciences,Xi’an 710600,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院精密导航定位与授时技术重点实验室,西安710600 [3]中国科学院大学,北京100049

出　　处：《全球定位系统》2021年第2期25-31,共7页Gnss World of China

基　　金：王宽诚率先人才计划“产研人才扶持项目”(Y965YR1701);北斗地基增强系统—中国第二代卫星导航系统重大专项(Y849KF1701)。

摘　　要：在全球范围内选取地处内陆、沿海和岛屿的85个国际GNSS服务(IGS)测站,对其一天的观测数据进行无海洋潮汐改正和加入GOT4.8海洋潮汐改正模型两种解算,分析了海洋潮汐负荷对全球不同地理区域IGS测站精密单点定位(PPP)精度的影响.结果表明:岛屿测站受海洋潮汐负荷的影响范围最广,改正量最大.加入海洋潮汐改正后,约91%的岛屿测站在PPP中定位误差得到了改正,沿海测站和内陆测站得到改正的比例分别约为85%和82%;海洋潮汐改正对测站的N方向几乎起不到改正的作用,对E方向的影响较小,对U方向影响最大,其中在岛屿测站的U方向上影响范围是2~8 mm,部分站点接近厘米级.A total of 85 IGS stations located inland,on the coast and on the islands are selected from around the world,and the position of these stations are solved by considering adding the global ocean tide model(GOT4.8)or not.The effect of ocean tidal load on the precise point positioning(PPP)accuracy of IGS stations in different geographical regions is analyzed and studied.The results show that ocean tidal load has the greatest impact on the station located on the island.After adding the ocean tide correction,about 91%of the positioning error of the island stations are improved,and the proportions of coastal stations and inland stations are about 85%and 82%,respectively.The ocean tide correction has almost no impact on the N direction of the station,and has little impact on the E direction,and has the greatest positive impact on the U direction.Among them,the impact range in the U direction of the island station is 2~8 mm,and that of some stations are close to the centimeter level.

关 键 词：海洋潮汐负荷 精密单点定位(PPP) IGS测站 GOT4.8 海洋潮汐改正 

分 类 号：P228.4[天文地球—大地测量学与测量工程]