电离层对普通GPS和位置差分GPS定位误差的影响

在没有选择可用性条件下，差分ＧＰＳ定位精度完全取决于电离层的空间不相关性，为了改进差分ＧＰＳ的校正算法，本文在月平均电离层时延等值图的基础上，建立了一个简单而又逼真的电离层模型，并分析了普通ＧＰＳ和位置差分ＧＰＳ仅电离层单一因素引入的定位误差。

Ionspheric Effects on Position Error of Conventional GPS and Position Differential GPS

In the absence of the selective availability errors,the positioning accuracy of differential GPS is strongly dependent on the spatial decorrelation of the ionosphere. To improve the algorithm of the correction in differential GPS,this paper presents a simple and vivid ionospheric model on the basis of the contours of monthly average ionospheric time delay,and analyses the positioning error introduced only by the ionospheric delay in the conventional GPS and the position differential GPS.