SHA: the GNSS Analysis Center at SHAO Junping Chen, Bin Wu, Xiaogong Hu Haojun Li, Xiao Pei, Yize Zhang Shanghai Astronomical Observatory (SHAO) 22 Content IGS Products status Challenges in GNSS data analysis GNSS Analysis Center at SHAO SHA Products Summary 33 IGS Products Status IGS: Free and volunteer.., but service should follow NASAs policy Home page and ftp are denied for Chinese IP since 2011 Doy 327 (Nov. 23) Alternate: IGN mirror GPS Orbits (cm) GPS clocks (ns) Pole (mas) Lod ( s) Coordinates(mm)/ velocities(mm/year) IGS Horizontal: 3.0/2.0 Height: 6.0/3.0 IGR IGUA IGUB 44 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 55 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 66 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 77 Combined GNSS analysis model Instrument delay Same for all GPS; Glonass: per Freq. or per sat. Satellite clock for GPS and Glonass 88 Combined GNSS analysis model Instrument delay Same for all GPS; Glonass: per Freq. or per sat. Inter-system bias (instrument delay bias) as observed at each station. D Satellite clock for GPS and Glonass Station inter-system instrument bias Site: SHAO (CMONOC), GPS+GLONASS observations Spanning from: Doy 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 11 Challenges in GNSS data analysis Huge network solution: Number of satellites 12 Challenges in GNSS data analysis Huge network solution: Number of parameters 13 Challenges in GNSS data analysis Real-time GNSS analysis RT-PP network, BKG 14 Challenges in GNSS data analysis Real-time GNSS analysis Stream delay and PPP accuracy J. Chen etc, Marine Geodesy 15 SHA: GNSS data analysis at SHAO 15 Group of GNSS Data Analysis and Applications at SHAO (GGDAA) Applied for the IGS Multi-GNSS data analysis (IGS M-GEX)Multi-GNSS data analysisIGS M-GEX Working towards GGOS-C Data and Analysis Center for CMONOC network (SHA) Daily routine for global GNSS network + CMONOC network Towards Compass/Beidou Analysis center 16 SHA: GNSS data analysis at SHAO 16 Group of GNSS Data Analysis and Applications at SHAO (GGDAA) GNSS orbits GNSS clocks: 30 seconds for GPS & GLONASS Coordinates & Reference frame Improving China Terrestrial Reference Frame GNSS Time Offset (TO) Trop. ERP. Etc. GPS/GLONASS Network IGS network analyzed at SHAO 17 CMONOC Network Crustal Movement Observation Network of China (CMONOC): 260 Permanent + ~2000 Campaign GNSS stations Average baseline: 200~300 km 18 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