Positioning accuracy assessment for the 4GEO/5IGSO/2MEO constellation of COMPASS
Zhou ShanShi1; Cao YueLing1; Zhou JianHua2; Hu XiaoGong1; Tang ChengPan1; Liu Li2; Guo Rui2; He Feng2; Chen JunPing1; Wu Bin1
AbstractDetermined to become a new member of the well-established GNSS family, COMPASS (or BeiDou-2) is developing its capabilities to provide high accuracy positioning services. Two positioning modes are investigated in this study to assess the positioning accuracy of COMPASS' 4GEO/5IGSO/2MEO constellation. Precise Point Positioning (PPP) for geodetic users and real-time positioning for common navigation users are utilized. To evaluate PPP accuracy, coordinate time series repeatability and discrepancies with GPS' precise positioning are computed. Experiments show that COMPASS PPP repeatability for the east, north and up components of a receiver within mainland China is better than 2 cm, 2 cm and 5 cm, respectively. Apparent systematic offsets of several centimeters exist between COMPASS precise positioning and GPS precise positioning, indicating errors remaining in the treatments of COMPASS measurement and dynamic models and reference frame differences existing between two systems. For common positioning users, COMPASS provides both open and authorized services with rapid differential corrections and integrity information available to authorized users. Our assessment shows that in open service positioning accuracy of dual-frequency and single-frequency users is about 5 m and 6 m (RMS), respectively, which may be improved to about 3 m and 4 m (RMS) with the addition of differential corrections. Less accurate Signal In Space User Ranging Error (SIS URE) and Geometric Dilution of Precision (GDOP) contribute to the relatively inferior accuracy of COMPASS as compared to GPS. Since the deployment of the remaining 1 GEO and 2 MEO is not able to significantly improve GDOP, the performance gap could only be overcome either by the use of differential corrections or improvement of the SIS URE, or both.
KeywordPPP real-time positioning authorized services orbit determination
Funding Project[Shanghai Committee of Science and Technology] ; [National Natural Sciences Foundation of China] ; [China Satellite Navigation Conference] ; [NSFC]
Document Type期刊论文
2.Beijing Global Informat Applicat & Dev Ctr, Beijing 100094, Peoples R China
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhou ShanShi,Cao YueLing,Zhou JianHua,et al. Positioning accuracy assessment for the 4GEO/5IGSO/2MEO constellation of COMPASS[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2012,55(12):2290.
APA Zhou ShanShi.,Cao YueLing.,Zhou JianHua.,Hu XiaoGong.,Tang ChengPan.,...&Wu Bin.(2012).Positioning accuracy assessment for the 4GEO/5IGSO/2MEO constellation of COMPASS.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,55(12),2290.
MLA Zhou ShanShi,et al."Positioning accuracy assessment for the 4GEO/5IGSO/2MEO constellation of COMPASS".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 55.12(2012):2290.
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