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SHA: the GNSS Analysis Center at SHAO Junping Chen, Bin Wu, Xiaogong Hu

SHA: the GNSS Analysis Center at SHAO Junping Chen, Bin Wu, Xiaogong Hu Haojun Li, Xiao Pei, Yize Zhang Shanghai Astronomical Observatory (SHAO) junping@shao.ac.cn. Content. IGS Products status Challenges in GNSS data analysis GNSS Analysis Center at SHAO SHA Products Summary. 2.

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SHA: the GNSS Analysis Center at SHAO Junping Chen, Bin Wu, Xiaogong Hu

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  1. SHA: the GNSS Analysis Center at SHAO Junping Chen, Bin Wu, Xiaogong Hu Haojun Li, Xiao Pei, Yize Zhang Shanghai Astronomical Observatory (SHAO) junping@shao.ac.cn

  2. Content • IGS Products status • Challenges in GNSS data analysis • GNSS Analysis Center at SHAO • SHA Products • Summary 2

  3. IGS Products Status • IGS: Free and volunteer….., but service should follow NASA’s policy • Home page and ftp are denied for Chinese IP since 2011 Doy 327 (Nov. 23)… Alternate: IGN mirror 3

  4. Challenges in GNSS data analysis Multi-system data analysis and handling of new frequencies/data types • Current standard settings • L1/L2 ionosphere-free combination • All products (orbits & clocks & coordinates …) based on this… • But… • New System & satellites & Frequencies 4

  5. Challenges in GNSS data analysis Multi-system data analysis and handling of new frequencies/data types • Current standard settings • L1/L2 ionosphere-free combination • All products (orbits & clocks & coordinates …) based on this… • But… • New System & satellites & Frequencies • Clock difference between L1/L2 comb. And L1/L5 comb. Montenbruck etc, GPS solutions 5

  6. Challenges in GNSS data analysis Multi-system data analysis and handling of new frequencies/data types • Current standard settings • L1/L2 ionosphere-free combination • All products (orbits & clocks & coordinates …) based on this… • But… • New System & satellites & Frequencies • IGS MGEX: • call for data (GPS/GLONASS/GALILEO/BD/QZSS) • Experience in M-GNSS data analysis • Resolution in bias issues • New standards/suggestions for products 6

  7. Combined GNSS analysis model Instrument delay Same for all GPS; Glonass: per Freq. or per sat. Satellite clock for GPS and Glonass 7

  8. Combined GNSS analysis model Instrument delay Same for all GPS; Glonass: per Freq. or per sat. Satellite clock for GPS and Glonass D Inter-system bias (instrument delay bias) as observed at each station. 8

  9. Station inter-system instrument bias Site: SHAO (CMONOC), GPS+GLONASS observations Spanning from: Doy 165 - 365 2011 Constant bias parameter per Glo sat. at Daily/12h/6h/hour interval Parameter interval make differences!!(not shown here) 9

  10. Challenges in GNSS data analysis Huge network solution: Number of stations R. Ferland. 2010 10

  11. Challenges in GNSS data analysis Huge network solution: Number of satellites 11

  12. Challenges in GNSS data analysis Huge network solution: Number of parameters 12

  13. Challenges in GNSS data analysis Real-time GNSS analysis RT-PP network, BKG 13

  14. Challenges in GNSS data analysis Real-time GNSS analysis Stream delay and PPP accuracy J. Chen etc, Marine Geodesy 14

  15. SHA: GNSS data analysis at SHAO • Groupof GNSS Data Analysis and Applications at SHAO (GGDAA) • http://www.shao.ac.cn/shao_gnss_ac • Applied for the IGSMulti-GNSS data analysis (IGS M-GEX) • Working towards GGOS-C • Data and Analysis Center for CMONOC network (SHA) • Daily routine for global GNSS network + CMONOC network • Towards Compass/BeidouAnalysis center 15 15 15

  16. SHA: GNSS data analysis at SHAO • Groupof GNSS Data Analysis and Applications at SHAO (GGDAA) • http://www.shao.ac.cn/shao_gnss_ac • GNSS orbits • GNSS clocks: 30 seconds for GPS & GLONASS • Coordinates & Reference frame • Improving China Terrestrial Reference Frame • GNSS Time Offset (TO) • Trop. ERP. Etc. 16 16 16

  17. GPS/GLONASS Network IGS network analyzed at SHAO 17

  18. CMONOC Network Crustal Movement Observation Network of China (CMONOC): 260 Permanent + ~2000 Campaign GNSS stations Average baseline: 200~300 km 18

  19. CMONOC Network Crustal Movement Observation Network of China (CMONOC): 260 Permanent + ~2000 Campaign GNSS stations Average baseline: 200~300 km 19

  20. Products of SHA: e.g. GNSS orbits • GNSS Orbits • GPS+GLONASS • Compared to IGS • <2 cm for GPS; <5 cm for GLONASS 20

  21. Products of SHA: e.g. GNSS orbits • GNSS Orbits • GPS+GLONASS • Compared to IGS • <2 cm for GPS; <5 cm for GLONASS 21

  22. Products of SHA: e.g. GNSS clocks • GNSS clocks: 30 seconds • GPS+GLONASS • Compared to IGS • <0.05 ns for GPS; <0.15 ns for GLONASS 22

  23. Products of SHA: e.g. GNSS clocks • GNSS clocks: 30 seconds • GPS+GLONASS • Compared to IGS • <0.05 ns for GPS; <0.15 ns for GLONASS 23

  24. GNSS system Time Offset model Solution 1: TO= GLONASST – GPSt = [GLONASST – UTC(SU) ] – [GPSt - UTC(USNO)] + [UTC(SU)-UTC(USNO) ] GLONASS Broadcast GPS Broadcast BIPM bulletin Solution 2: Broadcast GLONASS clocks GLONASS clocks from Multi-GNSS solutions, using GPSt as reference 24

  25. GPS/GLONASS system Time offset System Time Offset: GLONASST – GPSt SHA: TO from GNSS routines at SHAO BRDC: TO based on Predicted value from GPS/GLONASS broadcast (UTC(SU)-UTC(USNO) not considered) General good agreement at 5ns level (broadcast clock accuracy) Targeting to improve inter-operation: GPS+GLONASS 25

  26. Summary SHA: GNSS Analysis Center at SHAO Facilities supporting GNSS research & applications http://www.shao.ac.cn/shao_gnss_ac 26

  27. http://www.shao.ac.cn/shao_gnss_ac Thank you! 27

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