联合GPS相位观测值与全球电离层图提取区域电离层TEC

Local Ionospheric TEC Extraction Based on GPS Phase Observations and Global Ionospheric Maps

提出一种结合GPS相位观测值与全球电离层图提取区域电离层总电子含量的方法。由于没有采用伪距观测值,无需考虑差分码偏差的影响。实验表明,在不同区域以及不同电离层活动条件下,用该方法改正电离层延迟,其单频定位精度较采用全球电离层图有显著提高,与采用相位平滑伪距电离层延迟改正的结果总体上相当。

In this paper, we propose a new method to extract local ionospheric Total Electron Content （TEC） from combined GPS phase observations and global ionospheric maps, considering the effect of differential code bias on phase smoothing code observations, as well as the lower accuracy of global ionospheric maps. This method does not need to consider the impact of differential code bias in the absence of code observations. The results show that the accuracy of single-frequency positioning using ionospheric delay correction with the proposed method improves significantly compared to that of global ionospheric maps. Moreover, overall it is consistent with the correction method of phase smooth code observations under different regions and different activity conditions of ionosphere.