不同模型下海潮负荷对高精度GPS测量的影响  

EFFECT OF OCEAN TIDE LOADING ON HIGH PRECISE GPS MEASUREMENT BASED ON DIFFERENT MODELS

作　　者：方川[1] 高井祥[1] 王坚[1] 胡洪[1] 

机构地区：[1]江苏省地质测绘院,南京210008

出　　处：《大地测量与地球动力学》2014年第4期135-139,144,共6页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金项目(41074010);江苏省普通高校研究生科研创新计划项目(CXZZ12_0939);江苏高校优势学科建设工程项目(SZBF2011-6-B35)

摘　　要：以中国内陆和沿海IGS站为例，分别采用FES2004海潮模型、NA099b海潮模型以及不同的地球模型计算海潮负荷对测站位移和基线长度的影响。结果表明，海潮负荷对测站位移的影响可达cm级，主要体现在U方向，沿海地区约为内陆地区的3～4倍；不同海潮模型之间的差异在沿海地区达到mm级，而不同地球模型之间的差异很小，可以忽略；海潮对GPS基线长度的相对影响约为10～。海潮负荷对基线分量影响的规律和测站类似，大小在mm级，对天顶延迟测定的影响在沿海地区可达1cm。Through example of IGS stations in China＇ s inland and coastal, the FES2004 and NAO99b ocean tidal model which are advanced models at present and different earth models are adopted to calculate the effect of o- cean tide loading on displacement of station and baseline length, the results show that the magnitude of the effect on displacement of station is up to centimeter, which is mainly reflected on the U direction, the magnitude of offshore stations is 3 -4 times as large as that of inland stations, the differences between the different ocean models achieve the magnitude of millimeter in coastal areas, and the differences between different earth model is small, which can be ignored,the relative influence of ocean tide loading on GPS baseline length is about 10-s. The data of several days is processed through GAMIT, the results of calculation show that the effect of ocean loading on baseline compo- nents is similar to that of stations, the magnitude of which is millimeter, the influence on the determination of zenith delay in coastal regions can be up to 1 cm.

关 键 词：海潮负荷 海潮模型 地球模型 基线分量 天顶延迟 

分 类 号：P228[天文地球—大地测量学与测量工程]