中文摘要：

描述了高阶电离层误差对精密单点定位（precise point positioning,PPP）的影响公式,并通过实验分析了该误差对PPP静动态定位的影响。数值结果表明,改正电离层高阶项误差可以mm级提高PPP静动态定位精度和缩短动态定位的收敛时间。

英文摘要：

Ionospheric delay is one of the main error sources in GNSS positioning. This paper describes a formula derived to correct higher-order ionosphere error of La observation and an- alyzed the effects on the static and kinematic positioning accuracy. Numerical results show that correcting the higher-order ionospheric error improves the PPP static and kinematic po- sitioning accuracy and shorten the convergence time of PPP kinematic positioning.