基于滑窗初始点dSTEC定权的全球实时电离层综合

doi:10.11947/j.AGCS.2024.20220351

测绘学报 ›› 2024, Vol. 53 ›› Issue (2): 296-305.doi: 10.11947/j.AGCS.2024.20220351

基于滑窗初始点dSTEC定权的全球实时电离层综合

王宁波¹, 李子申^1,2,3, 李昂^1,2, 张研^1,2, 刘昂^1,2, 汪亮¹

1. 中国科学院空天信息创新研究院, 北京 100094;
2. 中国科学院大学电子电气与通信工程学院, 北京 100049;
3. 齐鲁空天信息研究院, 山东济南 250101

收稿日期:2022-05-28 修回日期:2023-10-07 发布日期:2024-03-08
通讯作者: 李子申 E-mail:lizishen@aircas.ac.cn
作者简介:王宁波(1987-),男,博士,副研究员,研究方向为北斗精准可信定位与卫星导航电离层监测建模。E-mail:wangnb@aircas.ac.cn
基金资助:
国家重点研发计划（2021YFB3901300）；国家自然科学基金（42122026；42174038；42074043）

Sliding window based GNSS dSTEC weighting method for real-time combination of global ionospheric maps

WANG Ningbo¹, LI Zishen^1,2,3, LI Ang^1,2, ZHANG Yan^1,2, LIU Ang^1,2, WANG Liang¹

1. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China;
2. School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
3. Qilu Aerospace Information Research Institute, Jinan 250101, China

Received:2022-05-28 Revised:2023-10-07 Published:2024-03-08
Supported by:
The National Key Research and Development Program of China (No. 2021YFB3901300); The National Natural Science Foundation of China (Nos. 42122026; 42174038; 42074043)

摘要/Abstract

摘要： 自2017年起，国际GNSS服务组织（IGS）部分电离层分析中心先后提供全球实时电离层校正服务。针对实际应用中单一分析中心实时电离层产品存在的可靠性差问题，本文提出了基于滑窗初始点差分斜向总电子含量（dSTEC）定权的全球实时电离层综合方法。以中国科学院（CAS）、法国空间研究中心（CNES）、西班牙加泰罗尼亚理工大学（UPC）及武汉大学（WHU）实时产品为基础，实现了实时全球电离层地图（RT-GIM）产品的例行综合。从电离层延迟误差修正、单频标准单点定位（SF-SPP）及单频精密单点定位（SF-PPP） 3个方面，分析2022年2月15日至2022年3月15日综合RT-GIM产品的应用性能。以IGS事后GIM为参考，本文综合RT-GIM与UPC综合RT-GIM对应的RMS为分别为3.30和3.20 TECU，二者精度相当；以定位残差95%分位数为统计量，与IGS事后GIM产品相比，综合RT-GIM对应的SF-SPP及SF-PPP精度分别低7.7%和4.9%；与北斗三号广播电离层模型BDGIM相比，综合RT-GIM对应的SF-SPP及SF-PPP精度分别提升了15.9%和9.5%。自2022年起，CAS综合RT-GIM产品已例行提交至IGS。

关键词: 实时全球电离层地图, 差分斜向总电子含量, 滑动窗口, 实时综合, 实时服务

Abstract: Real-time global ionospheric corrections have been provided by several ionospheric analysis centers of the International GNSS Service (IGS) since 2017. Considering the potential unstable ionospheric streams from individual analysis centers in real applications, we propose a sliding window based differential slant total electron content (dSTEC) weighting technique for the combination of real-time global ionospheric maps (RT-GIMs). The combined RT-GIMs are generated using real-time ionospheric streams from the Chinese Academy of Sciences (CAS), Centre National d'Etudes Spatiales (CNES), Polytechnic University of Catalonia (UPC) and Wuhan University (WHU). The performance of combined RT-GIMs is validated during 15 February and 15 March 2022 in both ionospheric correction and positioning domains. The root mean square (RMS) differences between combined RT-GIM and IGS-GIM are 3.30 TECU for our combined one, and 3.20 TECU for UPC combined one. The positioning performance of combined RT-GIMs is also evaluated in ionospheric corrected single-frequency standard point positioning (SF-SPP) and ionospheric constricted single-frequency precise point positioning (SF-PPP), by analyzing the 95% quantile of positioning residuals. Compared to IGS-GIM corrected results, the positioning accuracy of combined RT-GIMs decreases by 7.7% and 4.9% in SF-SPP and SF-PPP analysis, respectively. Compared to BDGIM corrected results, the positioning accuracy of combined RT-GIMs increases by 15.9% in SF-SPP and 9.5% in SF-PPP, respectively. CAS combined RT-GIMs have been routinely provided to the IGS since 2022.

Key words: real-time global ionospheric map, differential slant total electron content, sliding window, real-time combination, real-time service

中图分类号:

P228

王宁波, 李子申, 李昂, 张研, 刘昂, 汪亮. 基于滑窗初始点dSTEC定权的全球实时电离层综合[J]. 测绘学报, 2024, 53(2): 296-305.

WANG Ningbo, LI Zishen, LI Ang, ZHANG Yan, LIU Ang, WANG Liang. Sliding window based GNSS dSTEC weighting method for real-time combination of global ionospheric maps[J]. Acta Geodaetica et Cartographica Sinica, 2024, 53(2): 296-305.

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基于滑窗初始点dSTEC定权的全球实时电离层综合

Sliding window based GNSS dSTEC weighting method for real-time combination of global ionospheric maps

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