Data processing for GPS precise point positioning

Abstract

在GPS精密点定位数据处理中,通常采用所谓无差分模型。然而,GPS单站观测量也可通过不同差分组合以减少未知参数数目,且在理论上与无差分模型等价。文中利用实际GPS观测数据,比较了不同点定位差分模型的定位精度和其他指标。 In the data processing of the precise point positioning (PPP), the un-difference method is commonly used. However, GPS measurements can be differenced with satellites or different observation epochs. In theory, these differencing approaches should be mathematically equivalent. The positioning performance of different PPP data models, including un-difference (UD), satellite difference (SD), time difference (TD) and time-satellite difference (TSD), is examined using the 24 h GPS observation. The positioning accuracy, convergence of ambiguity, and tropspheric delay estimation with these four models are compared with each other.