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Observable quality assessment of broadband very long baseline interferometry system
Xu, Ming H.1,2,3,4; Anderson, James M.3,5; Heinkelmann, Robert5; Lunz, Susanne5; Schuh, Harald3,5; Wang, Guangli4
2021-05-01
Source PublicationJOURNAL OF GEODESY
ISSN0949-7714
Volume95Issue:5Pages:14
AbstractThe next-generation, broadband geodetic very long baseline interferometry system, named VGOS, is developing its global network, and VGOS networks with a small size of 3-7 stations have already made broadband observations from 2017 to 2019. We made quality assessments for two kinds of observables in the 21 VGOS sessions currently available: group delay and differential total electron content (delta TEC). Our study reveals that the random measurement noise of VGOS group delays is at the level of less than 2 ps (1 ps = 10(-12) s), while the contributions from systematic error sources, mainly source structure related, are at the level of 20 ps. Due to the significant improvement in measurement noise, source structure effects with relatively small magnitudes that are not overwhelming in the S/X VLBI system, for instance 10 ps, are clearly visible in VGOS observations. Another critical error source in VGOS observations is discrete delay jumps, for instance, a systematic offset of about 310 ps or integer multiples of that. The predominant causative factor is found to be related to source structure. The measurement noise level of delta TEC observables is about 0.07 TECU, but the systematic effects are five times larger than that. A strong correlation between group delay and delta TEC observables is discovered with a trend of 40 ps/TECU for observations with large structure effects; there is a second trend in the range 60-70 ps/TECU when the measurement noise is dominant.
KeywordVGOS observations Ionosphere effects VLBI IVS Space geodesy Radio astronomy
Funding OrganizationAcademy of Finland ; Academy of Finland ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; German Research Foundation ; German Research Foundation ; Academy of Finland ; Academy of Finland ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; German Research Foundation ; German Research Foundation ; Academy of Finland ; Academy of Finland ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; German Research Foundation ; German Research Foundation ; Academy of Finland ; Academy of Finland ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; German Research Foundation ; German Research Foundation
DOI10.1007/s00190-021-01496-7
WOS KeywordREFERENCE FRAME
Language英语
Funding ProjectAcademy of Finland[315721] ; National Natural Science Foundation of China[11973023] ; National Natural Science Foundation of China[11873077] ; German Research Foundation[HE5937/2-2] ; German Research Foundation[SCHU1103/7-2]
Funding OrganizationAcademy of Finland ; Academy of Finland ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; German Research Foundation ; German Research Foundation ; Academy of Finland ; Academy of Finland ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; German Research Foundation ; German Research Foundation ; Academy of Finland ; Academy of Finland ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; German Research Foundation ; German Research Foundation ; Academy of Finland ; Academy of Finland ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; German Research Foundation ; German Research Foundation
WOS Research AreaGeochemistry & Geophysics ; Remote Sensing
WOS SubjectGeochemistry & Geophysics ; Remote Sensing
WOS IDWOS:000639851500001
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/78057
Collection中国科学院国家天文台
Corresponding AuthorXu, Ming H.
Affiliation1.Aalto Univ, Metsahovi Radio Observ, Metsahovintie 114, FI-02540 Kylmala, Finland
2.Aalto Univ, Dept Elect & Nanoengn, PL15500, FI-00076 Aalto, Finland
3.Tech Univ Berlin, Fak 6, Inst Geodasie & Geoinformat Tech, Sekr KAI 2-2,Kaiserin Augusta Allee 104-106, D-10553 Berlin, Germany
4.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
5.GFZ German Res Ctr Geosci, Helmholtz Ctr Potsdam, D-14473 Potsdam, Germany
Recommended Citation
GB/T 7714
Xu, Ming H.,Anderson, James M.,Heinkelmann, Robert,et al. Observable quality assessment of broadband very long baseline interferometry system[J]. JOURNAL OF GEODESY,2021,95(5):14.
APA Xu, Ming H.,Anderson, James M.,Heinkelmann, Robert,Lunz, Susanne,Schuh, Harald,&Wang, Guangli.(2021).Observable quality assessment of broadband very long baseline interferometry system.JOURNAL OF GEODESY,95(5),14.
MLA Xu, Ming H.,et al."Observable quality assessment of broadband very long baseline interferometry system".JOURNAL OF GEODESY 95.5(2021):14.
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