The cooperative IGS RT-GIMs: a reliable estimation of the global ionospheric electron content distribution in real time

被引：41

作者：

Liu, Qi ^{[1
]}

Hernandez-Pajares, Manuel ^{[1
,2
]}

Yang, Heng ^{[1
,3
]}

Monte-Moreno, Enric ^{[4
]}

Roma-Dollase, David ^{[2
]}

Garcia-Rigo, Alberto ^{[1
,2
]}

Li, Zishen ^{[5
]}

Wang, Ningbo ^{[5
]}

Laurichesse, Denis ^{[6
]}

Blot, Alexis ^{[6
]}

Zhao, Qile ^{[7
,8
]}

Zhang, Qiang ^{[7
]}

Hauschild, Andre ^{[9
]}

Agrotis, Loukis ^{[10
]}

Schmitz, Martin ^{[11
]}

Wubbena, Gerhard ^{[11
]}

Sturze, Andrea ^{[12
]}

Krankowski, Andrzej ^{[13
]}

Schaer, Stefan ^{[14
,15
]}

Feltens, Joachim ^{[16
]}

Komjathy, Attila ^{[17
]}

Ghoddousi-Fard, Reza ^{[18
]}

机构：

[1] Univ Politecn Catalunya UPC IonSAT, Dept Math, Barcelona, Spain

[2] Inst Estudis Espacials Catalunya IEEC, Barcelona, Spain

[3] Yangtze Normal Univ, Sch Elect Informat & Engn, Chongqing 408100, Peoples R China

[4] Univ Politecn Cataluna, Dept Signal Theory & Commun, TALP, ES-08034 Barcelona, Spain

[5] Chinese Acad Sci, Aerosp Informat Res Inst AIR, Beijing, Peoples R China

[6] Ctr Natl Etud Spatiales, Toulouse, France

[7] Wuhan Univ, GNSS Res Ctr, 129 Luoyu Rd, Wuhan 430079, Peoples R China

[8] Wuhan Univ, Collaborat Innovat Ctr Earth & Space Sci, 129 Luoyu Rd, Wuhan 430079, Peoples R China

[9] German Space Operat Ctr GSOC, German Aerosp Ctr DLR, D-82234 Wessling, Germany

[10] European Space Agcy, European Space Operat Ctr, Darmstadt, Germany

[11] Geo GmbH, Steinriede 8, D-30827 Garbsen, Germany

[12] Fed Agcy Cartog & Geodesy, BKG, Frankfurt, Germany

[13] Univ Warmia & Mazury, Space Radiodiagnost Res Ctr, PL-10719 Olsztyn, Poland

[14] Univ Bern, Astron Inst, Sidlerstr 5, CH-3012 Bern, Switzerland

[15] Fed Off Topog Swisstopo, Wabern, Switzerland

[16] Telespazio Germany GmbH, European Space Agcy, European Space Operat Ctr, Nav Support Off, Robert Bosch Str 5, D-64293 Darmstadt, Germany

[17] CALTECH, NASA, Jet Prop Lab, Near Earth Tracking Syst Grp 335S, 4800 Oak Grove Dr,M-S 138-317, Pasadena, CA 91109 USA

[18] Nat Resources Canada, Canadian Geodet Survey, Ottawa, ON, Canada

来源：

EARTH SYSTEM SCIENCE DATA | 2021年 / 13卷 / 09期

关键词：

SINGLE-FREQUENCY; VTEC MAPS; NETWORK; MODEL; SLANT;

D O I：

10.5194/essd-13-4567-2021

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The Real-Time Working Group (RTWG) of the International GNSS Service (IGS) is dedicated to providing high-quality data and high-accuracy products for Global Navigation Satellite System (GNSS) positioning, navigation, timing and Earth observations. As one part of real-time products, the IGS combined Real-Time Global Ionosphere Map (RT-GIM) has been generated by the real-time weighting of the RT-GIMs from IGS real-time ionosphere centers including the Chinese Academy of Sciences (CAS), Centre National d'Etudes Spatiales (CNES), Universitat Politecnica de Catalunya (UPC) and Wuhan University (WHU). The performance of global vertical total electron content (VTEC) representation in all of the RT-GIMs has been assessed by VTEC from Jason-3 altimeter for 3 months over oceans and dSTEC-GPS technique with 2 d observations over continental regions. According to the Jason-3 VTEC and dSTEC-GPS assessment, the real-time weighting technique is sensitive to the accuracy of RT-GIMs. Compared with the performance of post-processed rapid global ionosphere maps (GIMs) and IGS combined final GIM (igsg) during the testing period, the accuracy of UPC RTGIM (after the improvement of the interpolation technique) and IGS combined RT-GIM (IRTG) is equivalent to the rapid GIMs and reaches around 2.7 and 3.0 TECU (TEC unit, 10(16) elm(-2)) over oceans and continental regions, respectively. The accuracy of CAS RT-GIM and CNES RT-GIM is slightly worse than the rapid GIMs, while WHU RT-GIM requires a further upgrade to obtain similar performance. In addition, a strong response to the recent geomagnetic storms has been found in the global electron content (GEC) of IGS RT-GIMs (especially UPC RT-GIM and IGS combined RT-GIM). The IGS RT-GIMs turn out to be reliable sources of real-time global VTEC information and have great potential for real-time applications including range error correction for transionospheric radio signals, the monitoring of space weather, and detection of natural hazards on a global scale. All the IGS combined RT-GIMs generated and analyzed during the testing period are available at https://doi.org/10.5281/zenodo.5042622 (Liu et al., 2021b).

引用

页码：4567 / 4582

页数：16