一种基于接收机钟差广义插值法的卫星定位增强算法

An Enhanced Satellite Positioning Algorithm Based on Generalized Interpolation Method of Receiver Clock Error

为提高卫星定位的连续性与精度,分析和讨论了接收机钟差模型辅助定位的可行性与基础,结合广义插值方法建立了一种高精度钟差数学模型及其相应的增强定位算法。该优化拟合模型在分段边界点上满足插值条件,不断利用钟差观测序列的最新均值或加权均值插值点对模型进行约束,使其具有更好的实时性及更高的外推精度。通过GPS实测实验,对方法的可行性和精度进行了分析与验证。结果表明,基于该模型的增强定位算法,既可辅助卫星信号短暂缺失的非完备定位情况,实现三维定位,也可用于正常星座的定位情况,有效提高定位精度。

In order to improve the continuity and accuracy of satellite positioning,basis and feasibility of the positioning method assisted with receiver clock error model are analyzed and discussed in this paper.A high-accuracy receiver clock error mathematical model and the corresponding assisted positioning algorithms are established.The optimized fitting model satisfies interpolation conditions in the piecewise boundary points.The interpolation points of the latest mean value or weighted mean value of clock error series are used to constrain the model,and make real-time performance better and extrapolation accuracy higher.Feasibility and accuracy of the method are analyzed and tested by using the GPS measurement experiment.The present work indicates that the enhanced algorithm based on the model not only can assist the incomplete constellation positioning situation to achieve three-dimensional positioning,but also can enhance the complete constellation positioning and improve the positioning accuracy effectively.