长距离GPS基线及卫星定轨计算精度
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摘要
利用６个ＧＰＳ固定观测点３天的观测资料，采用伯尔尼３．５版软件用多种方法计算了长距离ＧＰＳ基线边及ＧＰＳ卫星轨道参数。结果表明，对８００～３０００ｋｍ的ＧＰＳ基线，利用精密星历计算，边长及其经纬度分量重复测量精度可达１０－８～１０－９；同精密星历相比，２天轨道弧段的定轨精度为１～４ｍ（坐标中误差）。显然，采用ＩＧＳ（国际地球动力学ＧＰＳ服务处）计算中心的精密星历可以满足地球动力学及地震预报研究对ＧＰＳ的精度要求，而利用国内的观测点资料作ＧＰＳ卫星定轨，可以满足一般测量的精度要求
GPS observation data at 6 stations in Tianjin, Xi'an, Changchun, Haikou, Shanghai and Ulumqi for 3 days are processed with Bernese 3.5 GPS software for the determination of long distance baselines and the orbits. The results show that for baselines of 800～3000 km the repeatability of baseline lengths and their latitude and longitude components is 10 -8 ～10 -9 as calculated with precise ephemerides; compared with the precise orbit, the accuracy of the determined 2 day arcs of the orbits is 1～4m (standard deviation in coordinates). IGS (International GPS Service for Geodynamics) ephemerides from the IGS analysis centers can be used to get high accuracy needed for the study on geodynamics and earthquake prediction while the orbits of GPS satellites determined with data observed at the stations in China can be used to get the accuracy for ordinary geodetic surveys.
GPS observation data at 6 stations in Tianjin, Xi'an, Changchun, Haikou, Shanghai and Ulumqi for 3 days are processed with Bernese 3.5 GPS software for the determination of long distance baselines and the orbits. The results show that for baselines of 800～3000 km the repeatability of baseline lengths and their latitude and longitude components is 10 -8 ～10 -9 as calculated with precise ephemerides; compared with the precise orbit, the accuracy of the determined 2 day arcs of the orbits is 1～4m (standard deviation in coordinates). IGS (International GPS Service for Geodynamics) ephemerides from the IGS analysis centers can be used to get high accuracy needed for the study on geodynamics and earthquake prediction while the orbits of GPS satellites determined with data observed at the stations in China can be used to get the accuracy for ordinary geodetic surveys.
引文
1顾国华，孙汉荣．三种GPS接收机长距离对比试验观测数据处理与分析．大地形变测量，1996，12（1）：20．2BeutlerG，etal．ExtendedorbitmodelingtechniquesattheCODEprocesingcenteroftheinternationalGPSserviceforgeodynamics（IGS）：theoryandinitialresults．ManuscriptaGeodaetica，1994，19：367～386．
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