综合伪距相位观测的实时电离层延迟格网改正算法研究

针对北斗广域差分系统实时电离层延迟格网改正信息是基于伪距观测计算，而相位观测值具有更高的观测精度，提出伪距数据结合相位历元间差分数据综合解算电离层延迟的算法。基于陆态网GPS实测数据对该伪距相位综合算法进行实验验证，结果表明，综合伪距相位算法相比单纯伪距法可以获得平滑、稳定、精度更高的站星斜路径方向电离层延迟值。在此基础上，全天所有实时电离层延迟格网的内符合精度平均提高30.2%，外符合精度平均提高27.8%。

Research of Real-Time Ionospheric Delay Grid Correction Algorithm Based on Pseudo-Range and Phase Observation

As the real-time ionospheric delay grid correct information of the Beidou wide area difference system is calculated based on pseudo-range observation and phase observation with higher observation accuracy, so this paper presents an ionospheric delay corrections algorithm based on carrier phase and pseudo-range combined observations. The experiment is carried out using the GPS data of land network to validate the algorithm. The results show that ionospheric delay corrections based on the new algorithm are smoother, more stable, and better than the pseudo-range observations. The mean inner precision of ionospheric delay grids is improved by 30.2%, and the mean external precision is improved 27.8%.