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周伟莉, 宋淑丽, 李培佳, 张志斌, 黄超, 黄勇, 王广利. 基于GNSS加密网的VLBI电离层时延修正方法[J]. 深空探测学报(中英文), 2020, 7(4): 362-370. DOI: 10.15982/j.issn.2095-7777.2020.20200056
引用本文: 周伟莉, 宋淑丽, 李培佳, 张志斌, 黄超, 黄勇, 王广利. 基于GNSS加密网的VLBI电离层时延修正方法[J]. 深空探测学报(中英文), 2020, 7(4): 362-370. DOI: 10.15982/j.issn.2095-7777.2020.20200056
ZHOU Weili, SONG Shuli, LI Peijia, ZHANG Zhibin, HUANG Chao, HUANG Yong, WANG Guangli. Ionospheric TEC Correction for VLBI Based on GNSS Density Network[J]. Journal of Deep Space Exploration, 2020, 7(4): 362-370. DOI: 10.15982/j.issn.2095-7777.2020.20200056
Citation: ZHOU Weili, SONG Shuli, LI Peijia, ZHANG Zhibin, HUANG Chao, HUANG Yong, WANG Guangli. Ionospheric TEC Correction for VLBI Based on GNSS Density Network[J]. Journal of Deep Space Exploration, 2020, 7(4): 362-370. DOI: 10.15982/j.issn.2095-7777.2020.20200056

基于GNSS加密网的VLBI电离层时延修正方法

Ionospheric TEC Correction for VLBI Based on GNSS Density Network

  • 摘要: 基于全球导航卫星系统(Global Navigation Satellite System,GNSS)反演的电离层模型是甚长基线干涉(Very Long Baseline Interferometry,VLBI)网(Chinese VLBI Network,CVN)电离层时延修正的有效方法。由于国际GNSS服务组织(International GNSS Services,IGS)跟踪网在中国区域较稀疏,针对探月工程高精度需求,提出了加密GNSS跟踪网的处理策略,构建了全球电离层精修正模型(ShangHai Astronomical Observatory,SHAO),并与欧洲定轨中心发布的全球电离层修正模型(Center for Orbit Determination in Europe,CODE)作对比。结果表明:在电离层平静期,采用两种模型计算的CVN站电离层时延相对均方根误差(Root Mean Square Error,RMSE)最大1.23 ns;在电离层活跃期,CVN站的电离层时延RMSE最大达16.80 ns。在电离层处于活跃期时,基于SHAO模型的VLBI定轨残差相比CODE模型在S1波段由6.07 ns提高到3.33 ns,S2波段由9.10 ns提高到7.07 ns,X0波段由0.70 ns 提高到0.60 ns。

     

    Abstract: Very long baseline interferometry(VLBI)is one of the key technologies for orbit determination of Chang'-E satellites in China's lunar exploration project. Ionospheric delay is one of the main errors of VLBI orbit determination. The ionospheric delay correction method based on GNSS inversion is given, which is used in the Chinese VLBI Network. Because there are few stations of international GNSS service(IGS)in China, in order to meet the demand of lunar exploration, more stations are will be builtin China and a new global ionospheric correction model(SHAO)is constructed. Compared with the CODE model, the maximum difference of ionospheric delay Root Mean Square Error(RMSE)on CVN stations is 1.23 ns during the ionospheric quiescence. During the active period of the ionosphere, the maximum difference of the ionospheric delay RMSE on CVN station is 16.80 ns. When the ionosphere is active, the VLBI orbit determination residual based on the SHAO model increases from 6.07 ns to 3.33 ns in S1 band, 9.10 ns to 7.07 ns in S2 band, 0.70 ns to 0.60 ns in X0 band compared with CODE model.

     

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