GRACE卫星几何定轨精度的时域和空域分析  

Time and Spatial Domain Analysis of GRACE Satellite Geometric Orbit Determination Accuracy

作　　者：王雅婷 胡梓木 WANG Yating;HU Zimu(31668 Troops,Xining 810000,China;32020 Troops,Wuhan 430000,China)

机构地区：[1]31668部队,青海西宁810000 [2]32020部队,湖北武汉430000

出　　处：《测绘与空间地理信息》2023年第7期54-56,共3页Geomatics & Spatial Information Technology

摘　　要：使用GRACE卫星星载GPS观测数据进行非差几何定轨,与JPL发布约化动力学轨道进行对比,轨道精度为厘米级。详细地分析了GRACE卫星几何轨道在空间上的分布特征以及影响因素,结果表明:由于HDOP、可见卫星数和GPS监测站分布的影响,GRACE卫星几何轨道的空间分布呈现出3个特征:1)定轨精度在陆地区域优于海洋区域;2)整体精度分布呈现出低纬部分精度低于高纬度部分;3)北纬60°区域精度较北极区域更高。Zero-difference geometric orbit determination using GRACE satellite on-board GPS observation data,compared with JPL published reduced dynamics orbit,the orbital accuracy reaches centimeter.The spatial distribution characteristics and influencing factors of GRACE satellite geometric orbits are analyzed in detail.The results show that the spatial distribution of GRACE satellite geometric orbit presents three characteristics because of the influence of HDOP,visible satellite number and GPS monitoring station distribution.(1) The orbital accuracy in ocean area is better than in terrestrial area.(2) The overall accuracy distribution shows that the low-latitude part is lower than the high-latitude part.(3) The accuracy of the 60 degree latitude is higher than that of the Arctic region.

关 键 词：GRACE 几何定轨 时域 空域 

分 类 号：P228[天文地球—大地测量学与测量工程]