单频GPS导航定位中的电离层延迟改正方法

A Novel Ionospheric Delay Correcting Method for GPS Single-Frequency Navigation and Positioning Applications

电离层延迟是单频GPS导航定位的主要误差源之一。本文提出了一种利用单频GPS接收机伪码-载波相位实时观测数据实时估计和改正电离层延迟的方法，着重阐述了利用局部电离层垂直延迟模型和实时观测数据确定载波相位整周模糊度的步骤，并讨论了该电离层改正方法的优缺点和应用前景。

Ionospheric delay is one of the largest error sources for single-frequency GPS naviga-tion and Positioning applications. In this paper, a novel ionospheric delay real-time estimating and cor-recting methed is prond which takes advantage of real-time pseudo random code and catrier phase observation data obtained by a single-frequency GPS receiver. The procedure to determine the phase integer ambigUity using a local ionospheric vertical delay model and real-time observation data, is highlighted. The virtues and limits of this method are discussed, and several applications are pro-posed.