GFZ Analysis Centre: Multi-GNSS Processing and Products
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1 GFZ Analysis Centre: Multi-GNSS Processing and Products Mathias Fritsche, Zhiguo Deng, Maik Uhlemann,Thomas Nischan, Markus Bradke, Markus Ramatschi, Andre Brand, Gerda Beeskow DeutschesGeoforschungsZentrum GFZ IGS Workshop on GNSS Biases, Bern, 06. November 2015
2 Outline I. GFZ contributions to IGS II. Multi-GNSS Experiment III. Multi-GNSS Processing Results Slide 2
3 I. GFZ contributions to IGS GFZ Global Multi-GNSS Station Network: Slide 3
4 I. GFZ contributions to IGS GFZ Analysis Center: Processing of GNSS data from global network (~ 200 stations) Primary products: Satellite orbits and clocks IGS products: GPS, GLONASS MGEX products: additionally Galileo, BeiDou, QZSS Reference frame products (station position and Earth rotation parameters) Related products: Tropospheric delay estimates (Precise Point Positioning) Broadcast of real-time GPS corrections for satellite orbits and clocks Slide 4
5 I. GFZ contributions to IGS Satellite orbit/clock product availability for different satellite systems: Product GPS GLONASS Galileo BeiDou QZSS Final Rapid Ultra-Rapid MGEX Real-Time IGS Slide 5
6 II. Multi-GNSS Experiment IGS Multi-GNSS Experiment: Focus: track, collate and analyze all available GNSS signals Support all GNSS: modernized GPS/GLONASS and new systems BeiDou, Galileo, QZSS Official call for participation in the Multi-GNSS Experiment in mid 2011 Approx ~ 140 stations at the moment Open data archives at CDDIS, IGN, BKG in RINEX 3.x ftp://cddis.gsfc.nasa.gov/pub/gps/data/campaign/mgex/ ftp://cddis.gsfc.nasa.gov/pub/gps/products/mgex/ analysis centres: CODE, GFZ, GRGS, TUM, ESOC, WHU, JAXA Slide 6
7 II. Multi-GNSS Experiment Global Multi-GNSS Station Network: Slide 7
8 II. Multi-GNSS Experiment Total number of MGEX-tracking stations: Slide 8
9 II. Multi-GNSS Experiment GNSS constellation status (September, 2015): Galileo Revolution period 14h 05min Actual number of satellites Signal carriers BeiDou Revolution period 12h 53min Actual number of satellites Signal carriers IOV(3): E11, E12, E19 (E20) FOC (4): E14, E18, E22, E26 (E24, E30) E1, E5a, E5b, E5(E5a+E5b), E6 GEO (5): C01, C02, C03, C04, C05 IGSO (5): C06, C07, C08, C09, C10 MEO (3): C11, C12, C14 (C13) B1, B2 (B3) QZSS Revolution period 23h 56min Actual number of satellites Signal carriers IGSO (1): J01 L2, L2, L5, L6 Slide 9
10 II. Multi-GNSS Experiment Galileo IOV satellite tracking: number of stations per satellite Slide 10
11 II. Multi-GNSS Experiment Galileo FOC satellite tracking: number of stations per satellite Slide 11
12 II. Multi-GNSS Experiment BeiDou MEO satellite tracking: number of stations per satellite Slide 12
13 III. Multi-GNSS Processing Results Multi-GNSS data processing: GNSS systems: GPS, GLONASS, Galileo, BeiDou, QZSS IGS-Rapid like processing configuration, i.e. daily solutions Roughly ~ 100 sites, IGS + MGEX data archives Regular processing since January 2014 Major processing settings: Orbit model: empirical CODE orbit model (5 parameter) Ambiguity fixing: GPS, GAL, BDS (IGSO, MEO) Antenna PCO/PCV: IGSwwww.atx + MGEX conventional values Observation model: undifferenced ionosphere-free linear combination Intersystem-bias setup: GLO per sta/sat-link, GAL/BDS/QZSS per station Slide 13
14 III. Multi-GNSS Processing Results Multi-GNSS data processing: Observation type selection System Signal carrier RX3 modulations (code/phase) GPS L1/L2 L1: WC L2: W GLONASS G1/G2 L1: PC L2: PC Galileo E1/E5a L1: CX L5: QX BeiDou B1/B2 L1: I L7: I QZSS L1/L2 L1: CX L2: X Slide 14
15 III. Multi-GNSS Processing Results Multi-GNSS station selection for IGS rapid-like solution: Slide 15
16 III. Multi-GNSS Processing Results Galileo, BeiDou, QZSS gound-track characteristics: Slide 16
17 III. Multi-GNSS Processing Results Galileo / BeiDou / QZSS site-specific visibility: Jiufeng (China) Arequipa (Peru) Slide 17
18 III. Multi-GNSS Processing Results GNSS satellites included in data processing: Slide 18
19 III. Multi-GNSS Processing Results Quality of GPS and GLONASS satellite positions: Similarity transformation of daily satellite positions w.r.t. official IGS-Rapid solution Slide 19
20 III. Multi-GNSS Processing Results GPS, GLONASS, Galileo, BeiDou, QZSS satellite position overlaps: Position differences at same epochs derived from independent observations Slide 20
21 III. Multi-GNSS Processing Results GNSS orbit validation using Satellite Laser Ranging (SLR): Bias SDEV Slide 21
22 III. Multi-GNSS Processing Results Satellite clock performance: Slide 22
23 III. Multi-GNSS Processing Results * BIAS/SOLUTION *BIAS SVN_ PRN SITE DOMES OBS1 OBS2 BIAS_START BIAS_END UNIT ESTIMATED_VALUE STD_DEV ISB C C BRST 10004M004 L1I L7I 15:305: :305:86399 ns ISB C C BRUX 13101M010 L1I L7I 15:305: :305:86399 ns ISB C C SIN M003 L1I L7I 15:305: :305:86399 ns ISB E E SCRZ 41801M001 L1C L5Q 15:305: :305:86399 ns ISB E E SEYG 39801M004 L1X L5X 15:305: :305:86399 ns ISB E E SIN M003 L1X L5X 15:305: :305:86399 ns ISB J J OWNG 50253M001 L1C L2X 15:305: :305:86399 ns ISB J J POHN 51601M001 L1X L2X 15:305: :305:86399 ns ISB J J PTVL 51402M002 L1X L2X 15:305: :305:86399 ns ISB J J SIN M003 L1X L2X 15:305: :305:86399 ns ISB R715 R14 OWNG 50253M001 L1P L2P 15:305: :305:86399 ns ISB R715 R14 PADO 12750S001 L1C L2P 15:305: :305:86399 ns ISB R715 R14 PBRI 22308M001 L1 L2 15:305: :305:86399 ns ISB R715 R14 SIN M003 L1P L2P 15:305: :305:86399 ns ISB R716 R15 SIN M003 L1P L2P 15:305: :305:86399 ns Slide 23
24 III. Multi-GNSS Processing Results Open/known issues: Clock reference system reporting (GPS!) C1W-C1C satellite bias handling (cc2noncc) Galileo C1C-C1W / C2Q-C2X satellite biases Slide 24
25 Next steps / future developments: Switch to ECOM2 orbit parameterisation (extended ECOM) Extend station selection to improve multi-gnss observation data coverage (time and geometry) Generation of consistent GAL clock / DCB product Provide all processing chains (Ultra/Rapid/Final) in multi-gnss mode Slide 25
26 Many thanks for your attention Slide 26
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