阐述了GPS共视法的基本原理,讨论了利用重力频移法通过GPS共视观测数据确定重力位差和高程差的方法。利用国际权度局(BIPM)发布的时间序列数据,选取了4个守时台站之间的时间差序列进行实验。结果表明,受目前GPS共视法精度所限,高程差计算值与理论值之间的平均差异和标准差在几十m的量级水平。
GPS common-view approach is currently a widely used technique in time transfer.We analyze the principle and model of GPS common-view method and present a method to gain geopotential difference and orthometric height difference using GPS common-view data based on gravity frequency shift.We choose the time difference series among four stations from BIPM Circular T data to carry out the experiment.Results show that due to accuracy limit of GPS CV,the mean difference and standard deviation between calculated value and theory value of the height difference are at the order of tens of meters.