基于不同海潮模型研究海潮负荷对GPS精密定位的影响  

EFFECT OF OCEAN TIDE LOADING ON GPS PRECISE POSITIONING BASED ON DIFFERENT OCEAN TIDE MODELS

作　　者：赵红[1] 张勤[1] 黄观文[1] 涂锐[1] 

机构地区：[1]长安大学大地质工程与测绘学院,西安710054

出　　处：《大地测量与地球动力学》2012年第5期108-112,共5页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(21712005473)

摘　　要：为研究海潮负荷在不同区域对GPS定位影响的规律,推导分析了海潮负荷对GPS测站定位影响的计算公式,并基于此,以江苏、西安区域GPS测站为例,用卫星测高数据反演获得的NAO99b海潮模型及FES2004海潮模型计算了海潮负荷对GPS定位以及对GPS基线的影响,结果表明海潮负荷对GPS沿海测站定位的影响达厘米量级,为内陆地区的4～5倍,而且海潮负荷对测站U方向的影响远大于对E、N方向的影响,海潮负荷对不同区域的GPS基线长度的影响均小于1 cm;结果比较表明NAO99b和FES2004海潮模型在内陆的差异很小,在沿海处差异较大(达1厘米以上)。In order to study the regular effect of ocean tide loading on GPS positioning in different regions,this paper deduces and analyzes the effect formula of ocean tide loading on GPS stations positioning.On this basis,through example of the GPS stations in Jiangsu and Xi＇an,the NAO99b and FES2004 ocean tide model which are inversed with T/P altimetry data,are synthetically adopted to calculate the effect of ocean tide loading on GPS positioning and baselines.The results show that the magnitude of the effect on GPS positioning of offshore stations is up to centimeter,which is 4-5 times as large as that of inland stations.And the effect of ocean tide loading on U direction is much larger than E,N directions and the effect difference on GPS baselines in different areas is less than 1 cm.From the comparison of NAO99b and FES2004 ocean models we know the effect of the two models have little difference in the inland,but on the coast the difference is large,which is 1 cm or more.

关 键 词：海潮模型 GPS基线 海潮负荷 GPS定位 卫星测高数据 

分 类 号：P312.4[天文地球—固体地球物理学]