Using DORIS data for validating real-time GNSS ionosphere maps

多丽丝(腹足类) 全球导航卫星系统应用 电离层 遥感 卫星 技术 总电子含量 定轨 大地测量学 环境科学 卫星系统 地质学 计算机科学 地球物理学 物理 电信 天文
作者
Ang Liu,Ningbo Wang,Denise Dettmering,Zishen Li,Michaël Schmidt,Liang Wang,Hong Yuan
出处
期刊:Advances in Space Research [Elsevier]
卷期号:72 (1): 115-128 被引量:2
标识
DOI:10.1016/j.asr.2023.01.050
摘要

The ionospheric information retrieved from the Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) system provides valuable and external data sources to examine the quality of existing Global Navigation Satellite System (GNSS) generated ionospheric models. The concept of DORIS differential Slant Total Electron Content (dSTEC) analysis is presented, to check the feasibility of DORIS data in the quality assessment of GNSS derived ionosphere models. Thanks to the large relative frequency ratio between the two frequencies of DORIS, the theoretical precision of DORIS dSTEC is at the level of 0.028 TECu, which is about 10 times better than that of GNSS derived dSTEC. Using 48 co-located DORIS beacon sites of the International DORIS service (IDS) and GNSS stations of the International GNSS Service (IGS), the comparison between DORIS and GNSS dSTEC assessments of Real-Time Global Ionospheric Maps (RT-GIMs) from different analysis centers is performed in this paper. The analysis is performed during the first 110 days of 2022. Based on the analysis results of more than 18,000,000 Jason-3 DORIS ionospheric observables, no systematical deviation is found between DORIS and RT-GIM derived dSTECs, with a mean bias of 0.14 TECu. Compared to DORIS dSTEC, the root-mean-square (RMS) of those RT-GIMs reaches 4.5–5.4 TECu at low-latitudes, which is 2.2–3.6 TECu in mid- and high-latitude regions. The latitudinal variation of RT-GIM errors is clearly observed in DORIS dSTEC analysis. In addition, the Pearson correlation coefficient between Jason-3 DORIS dSTEC RMS and GPS-plus-GLONASS dSTEC RMS is 0.81, and no significant dependence on GPS-only or GLONASS-only data is found. It is suggested to perform the dSTEC analysis with higher satellite elevation cutoff angle, e.g., 45°, to ensure a better consistency between DORIS and GNSS dSTEC assessments. Overall, DORIS dSTEC assessment provides an independent reference for the validation of GNSS based ionosphere maps.
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