单频精密单点定位电离层延迟处理方法研究

ON IONOSPHERIC DELAY PROCESSING METHODS FOR SINGLE FREQUENCY PRECISE POINT POSITIONING

单频精密单点定位时,利用不同映射函数,引入电离层参数在模型中进行实时电离层延迟估计,从而达到提高电离层误差修正的目的。通过对IGS跟踪站实测数据的计算,及与常规单层模型、Klobuchar模型和格网电离层模型结果的比较分析,验证了该方法的可行性和有效性。

In single frequency precise point positioning, ionospheric delay is one of the most important factors impacting the positioning accuracy. Because of the instability of the ionosphere and the fuzziness of the research of physical properties, the positioning accuracy is seriously limited when using the precision limited model for the correction. In order to eliminate the ionosphere error, it is proposed to introduce ionosphere parameter for real-time ionospheric delay estimation by applying different mapping functions. Through the calculation of measurement data from the IGS tracking station and the comparison among the results from the single model, Klobuchar model and the grid ionosphere model, the feasibility and effectiveness of the new method are verified. In the experiments, different mapping functions and the ionosphere parameters are selected and some significant conclusions are drawn.