中文摘要：

本文研究电离层异常波动对相位平滑伪距产生的滤波发散问题，提出一种基于低通滤波器的双平滑伪距滤波算法；对电离层异常波动进行探测，并优化平滑窗口，以达到既提高定位精度又避免滤波发散的目的。分析结果表明，此方法可以有效地探测出电离层异常波动，避免滤波发散导致的定位异常。

英文摘要：

This paper deals with the filtering divergence caused by the ionosphere anomaly, and propoces out a new double smoothing filter algorithm. This algorithm designs double smoothing filter with a low pass filter aiming at detecting the ionosphere so as to improve the position accuracy and avoid Filter divergence. The result indicates that the method can detect the ionosphere anomaly easily and avoid Filtering divergence.