Local Ionospheric TEC Extraction Based on GPS Phase
Observations and Global Ionospheric Maps
1 School of Civil Engineering and Architecture, East China Jiaotong University, 808 East-Shuanggang Street,Nanchang 330013, China[JP]
2 Yunnan Branch of China Three Gorges New Energy Corp., Chuncheng Road, Kunming 650000, China
Abstract：n 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.
