Research On GPS Satellite Clock Error Prediction Model Based On Relativistic Effect

GNSS (Global Navigation Satellite System) technology has been widely used to various fields of current technology measure technology, including, due to the early development, the GPS system has become the most widely used techniques.There are various types of errors has been inevitably contained in GPS measurements. Specially the relativistic effects errors could be much deducted by some models and methods. Precise Point Positioning (PPP) is a GPS’ development trend, and the track forecasting technology has to meet the requirements.However,for precise point positioning technology.the high-precision clock error prediction has become a major constraint.Currently,there are two models of GPS clock error prediction,and they are quadratic polynomial model, gray system model.The two models were built by datas analysement of clock errors themselves.Because there some imperfection in current the method of relativistic effect clock errors amendment.Therefor some residual errors had to been contained in satellites’clock errors.So, in this thesis,a different model that are base on the mechanism of the effect of relativistic have been built.In the thesis,three satellites’SP3 precise ephemeris will be the datas foundation to calculate for each model by using Matlab programming.The results show that for the early 15 days short-term clock errors’predication, the clock error prediction model of relativistic effects is the best.