G2+ worldwide positioning services

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Matthew Goode, Geodesist, Fugro-Intersite BV

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G2+ worldwide positioning services

  1. 1. Fugro’s G2+ worldwide centimetre-level positioning service Matthew Goode, Fugro Intersite B.V. Offshore Energy 2015, 14 October 2015, Amsterdam, Netherlands
  2. 2. www.fugro.com2 History of positioning within Fugro 1974 1986 1996 2001 1984 Starfix positioning system Transit system first used Satellite based DGPS High frequency DGPS service HP dual-frequency service
  3. 3. www.fugro.com3 History of positioning within Fugro 2006 2014 20152009 G4 multi-constellation PPP service G2+ ambiguity-fixed PPP service G2 GPS & GLONASS PPP service XP precise point positioning (PPP) service
  4. 4. www.fugro.com4  Orbit and clock corrections for GPS, GLONASS, BeiDou and Galileo  Improved availability and reliability  Galileo corrections available when Initial Operational Capability (IOC) announced by the European Union Starfix.G4
  5. 5. www.fugro.com5  Uses dual frequency code and carrier phase measurements.  Considering the listed parameters:  Precise satellite position known  Precise satellite clock known  Unknown receiver position of most interest  Integer ambiguity for carrier phase measurements cannot be separated from the hardware biases, so estimated as lumped real valued parameter.  Fixing ambiguity to an integer would give cm-level accuracy. Standard PPP
  6. 6. www.fugro.com6 GNSS orbit and clock corrections
  7. 7. www.fugro.com7 Standard PPP approach Precise orbits and clocks GNSS measurements PPP engine Position
  8. 8. www.fugro.com8  Satellite biases common for all receivers in a network.  Estimate satellite biases using reference station network and supply this to the user.  Single differencing using a reference satellite removes receiver biases.  Remaining estimated ambiguity has an integer nature.  Attempt to fix to the correct integer value for cm-level accuracy.  Ability to fix ambiguities to integer value is dependent on observation conditions. PPP with integer ambiguity resolution
  9. 9. www.fugro.com9 G2+ reference station network
  10. 10. www.fugro.com10 PPP-IAR approach Precise orbits and clocks GNSS measurements PPP engine Ambiguities fixed? Ambiguity fixed position Ambiguity float position Yes No Hardware biases Ionosphere Troposphere (optional)
  11. 11. www.fugro.com11 Static results
  12. 12. www.fugro.com12 Static results: local comparison  StarPack receivers located at Fugro reference stations.  Starfix.G2+ real-time orbit, clock and hardware bias corrections received through L-band link.  Identical set-up as used in the field.  95% accuracy of 3.5 cm in horizontal and 8 cm in vertical achieved.
  13. 13. www.fugro.com13 Static results: Bergen, Norway
  14. 14. www.fugro.com14 Static results: Bergen, Norway
  15. 15. www.fugro.com15 Static results: Great Yarmouth, United Kingdom
  16. 16. www.fugro.com16 Static results: Great Yarmouth, United Kingdom
  17. 17. www.fugro.com17 Static results: Houston, TX, USA
  18. 18. www.fugro.com18 Static results: Houston, TX, USA
  19. 19. www.fugro.com19 Static results: Leidschendam, The Netherlands
  20. 20. www.fugro.com20 Static results: Leidschendam, The Netherlands
  21. 21. www.fugro.com21 Static results: Starfix.G2 vs Starfix.G2+ Values above the Starfix.G2+ bars show the percentage improvement compared to Starfix.G2
  22. 22. www.fugro.com22 Static results: global comparison  Global distribution of 101 sites  Comparison between Starfix.G2 and Starfix.G2+ solutions  Comparison of global sites for one day  Comparison of one site over 8 days
  23. 23. www.fugro.com23 Static results: 7 October 2015, 101 sites
  24. 24. www.fugro.com24 Static results: 8 days, Perth, Australia
  25. 25. www.fugro.com25 Static results: 8 days, Istanbul, Turkey
  26. 26. www.fugro.com26 Static results: 8 days, Romoland, CA, USA
  27. 27. www.fugro.com27 Dynamic results
  28. 28. www.fugro.com28 Gulf of Mexico test bed
  29. 29. www.fugro.com29 Gulf of Mexico test bed
  30. 30. www.fugro.com30  Dynamic environment with real-time solution.  Two antennae mounted on a fixed surface with known distance.  Two StarPack receivers using common source of G2+ corrections (hardware biases).  Difference in north, east and up components calculated. Comparison between different sources of hardware delay G2+ corrections G2+ Solution (172) G2+ Solution (175) Vector calculated 172 175
  31. 31. www.fugro.com31 Vessel configuration 175172 175 172
  32. 32. www.fugro.com32 Baseline comparison
  33. 33. www.fugro.com33 Offshore Applications
  34. 34. www.fugro.com34 Offshore Applications: real-time tide measurement
  35. 35. www.fugro.com35 Offshore Applications: buoy height dynamics
  36. 36. www.fugro.com36 Offshore Applications: real-time platform monitoring
  37. 37. www.fugro.com37 Offshore Applications: Unmanned vessels Source: Rolls-Royce Holdings/Bloomberg
  38. 38. www.fugro.com38  Global real-time positioning with a 95% accuracy of 3.5 cm in horizontal and 8 cm in height.  Tailored for the offshore market.  Successfully tested in dynamic environments.  Already in use by Fugro customers. Conclusions
  39. 39. Matthew Goode GNSS R&D Team Geodesist Fugro Intersite B.V. Dillenburgsingel 69 Leidschendam 2263 HW The Netherlands M.Goode@fugro.nl

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