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Analysis and Assessment of BDS-2 and BDS-3 Broadcast Ephemeris: Accuracy, the Datum of Broadcast Clocks and Its Impact on Single Point Positioning
Jiao, Guoqiang1,2; Song, Shuli1; Liu, Yangyang3; Su, Ke1,2; Cheng, Na4; Wang, Shengli5
2020-07-01
Source PublicationREMOTE SENSING
Volume12Issue:13Pages:24
AbstractFor the global ordinary users, the broadcast ephemeris plays important roles in positioning, navigation and timing (PNT) services. With the construction of a new generation of the BeiDou navigation satellite system (BDS), the development of BDS has entered the era of globalization. It is meaningful for global users to analyze and assess the BDS-2 and BDS-3 broadcast ephemeris. Therefore, the satellite orbits and clock offsets calculated by broadcast ephemeris are compared with the precise orbit and clock offset products provided by three analysis centers (i.e., Helmholtz Centre Potsdam German Research Center for Geosciences (GFZ), Wuhan University (WHU) and Shanghai Astronomical Observatory (SHA)), and the corresponding signal-in-space range error (SISRE) and the orbit-only SISRE are analyzed to assess the accuracy of BDS broadcast ephemeris. Due to the upgrade of BDS-3 satellite hardware technology and inter-satellite links payload and the development of satellite orbit determination algorithm, the accuracy of broadcast orbit and clock offsets has been greatly improved. The root mean square (RMS) of BDS-3 broadcast orbit errors is improved by 86.30%, 89.47% and 76.86%, and the standard deviation (STD) is improved by 79.41%, 77.00% and 76.78% compared with BDS-2 in the radial, along-track and cross-track directions. The corresponding RMS and STD of all BDS-3 satellite clock offsets are improved by 40.34% and 52.49% than that of BDS-2, respectively. Meanwhile, the mean RMS and STD are 1.78 m and 0.40 m for BDS-2 SISRE, 1.72 m and 0.34 m for BDS-2 orbit-only SISRE, 0.50 m and 0.14 m for BDS-3 SISRE, and 0.17 m and 0.04 m for BDS-3 orbit-only SISRE. It is noteworthy that the average broadcast-minus-precise (BMP) clock values of BDS-2 and BDS-3 are inconsistent, which can indirectly prove that the datum of broadcast clock offsets for BDS-2 and BDS-3 are inconsistent. The inconsistency of the datum of satellite clock offsets and receiver hardware delay bias between BDS-2 and BDS-3 will result in the inter-system bias (ISB) on the receiver segment. For JAVAD TRE_3 receivers, the ISB is relatively small and thus can be ignored. However, for the TRIMBLE ALLOY, SEPT POLARX5, CETC-54-GMR-4016, CETC-54-GMR-4011, GNSS-GGR and UB4B0-13478 receivers, estimating ISB can improve the positioning accuracy of single point positioning (SPP) by 20.15%, 19.81% and 12.76% in north, east and up directions, respectively.
KeywordBDS-3 the datum of broadcast clocks inter-system bias (ISB) signal-in-space ranging error (SISRE) single point positioning (SPP)
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; key project of National Natural Science Fund ; key project of National Natural Science Fund ; National Key R&D Program of China ; National Key R&D Program of China ; key project of National Natural Science Fund ; key project of National Natural Science Fund ; National Key R&D Program of China ; National Key R&D Program of China ; key project of National Natural Science Fund ; key project of National Natural Science Fund ; National Key R&D Program of China ; National Key R&D Program of China ; key project of National Natural Science Fund ; key project of National Natural Science Fund
DOI10.3390/rs12132081
WOS KeywordMULTI-GNSS ; ORBIT DETERMINATION ; NAVIGATION ; SYSTEM ; PERFORMANCE ; GPS
Language英语
Funding ProjectNational Key R&D Program of China[2016YFB0501503-3] ; key project of National Natural Science Fund[41730109]
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; key project of National Natural Science Fund ; key project of National Natural Science Fund ; National Key R&D Program of China ; National Key R&D Program of China ; key project of National Natural Science Fund ; key project of National Natural Science Fund ; National Key R&D Program of China ; National Key R&D Program of China ; key project of National Natural Science Fund ; key project of National Natural Science Fund ; National Key R&D Program of China ; National Key R&D Program of China ; key project of National Natural Science Fund ; key project of National Natural Science Fund
WOS Research AreaRemote Sensing
WOS SubjectRemote Sensing
WOS IDWOS:000550831600001
PublisherMDPI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82607
Collection中国科学院国家天文台
Corresponding AuthorSong, Shuli
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Natl Time Serv Ctr, Xian 710600, Peoples R China
4.Shandong Jianzhu Univ, Coll Surveying & Geoinformat, Jinan 250101, Peoples R China
5.Shandong Univ Sci & Technol, Coll Ocean Sci & Engn, Qingdao 266590, Peoples R China
Recommended Citation
GB/T 7714
Jiao, Guoqiang,Song, Shuli,Liu, Yangyang,et al. Analysis and Assessment of BDS-2 and BDS-3 Broadcast Ephemeris: Accuracy, the Datum of Broadcast Clocks and Its Impact on Single Point Positioning[J]. REMOTE SENSING,2020,12(13):24.
APA Jiao, Guoqiang,Song, Shuli,Liu, Yangyang,Su, Ke,Cheng, Na,&Wang, Shengli.(2020).Analysis and Assessment of BDS-2 and BDS-3 Broadcast Ephemeris: Accuracy, the Datum of Broadcast Clocks and Its Impact on Single Point Positioning.REMOTE SENSING,12(13),24.
MLA Jiao, Guoqiang,et al."Analysis and Assessment of BDS-2 and BDS-3 Broadcast Ephemeris: Accuracy, the Datum of Broadcast Clocks and Its Impact on Single Point Positioning".REMOTE SENSING 12.13(2020):24.
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