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Three-Method Absolute Antenna Calibration Comparison

Three-Method Absolute Antenna Calibration Comparison. Andria Bilich (1) , Martin Schmitz (2) , Barbara Görres (3) , Philipp Zeimetz (3) , Gerald Mader (1) , Gerhard Wübbena (2). (1) NOAA / National Geodetic Survey. (2) Geo++ GmbH. (3) Institute for Geodesy and Geoinformation ,

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Three-Method Absolute Antenna Calibration Comparison

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  1. Three-Method Absolute Antenna Calibration Comparison Andria Bilich(1), Martin Schmitz(2), Barbara Görres(3), Philipp Zeimetz(3), Gerald Mader(1), Gerhard Wübbena(2) (1) NOAA / National Geodetic Survey (2) Geo++ GmbH (3) Institute for Geodesy and Geoinformation, University of Bonn

  2. Outline • Goals of Three-Method Comparison • Overview of Methods • Geo++ robot in field • UniBonn robot in anechoic chamber • NGS robot in field • Comparison • Antennas tested • Results • Conclusions

  3. Goal of Study • NGS to demonstrate agreement with approved IGS calibration institutions • For multiple absolute calibration methods/institutions to contribute to IGS ANTEX: • Establish compatibility (matching results) • Understand any differences • Evaluate different types of geodetic antennas • chokering, groundplane, rover

  4. Geo++ GmbH • Contributing to IGS since 2006 • Operational since 2000 • Similar robots at Hannover and Berlin contribute to IGS • Robot in field • 3-axis, 5 degrees of freedom • PCO remains fixed in space • All-in-view GNSS signals, receiver used? • Data analysis • Undifferenced phase data • Kalman filter

  5. University of Bonn • Approved by IGS AWG in 2010 • Robot in anechoic chamber • 2-axis • Vertical PCO remains fixed in space • Network analyzer and simulated signal • Data analysis • ???

  6. NOAA / NGS • Robot in field • Corbin, VA • 2-axis • PCO not fixed in space • All-in-view GPS signals • Data analysis • Short baseline • SeptentrioAsteRx navigation receiver • Time-differences of single-differenced phase • Unfiltered For specifics, see poster “Absolute Antenna Calibration at the National Geodetic Survey”

  7. Antennas in Comparison GPS L1/L2 only for this presentation.

  8. Trimble Zephyr 2(TRM55971.00) One antenna sample tested

  9. ** not yet accounted for PCO differences Trimble Zephyr 2 (TRM55971.00) Elevation-dependent PCV

  10. Trimble Zephyr 2 (TRM55971.00) Convention for comparison: • Shift to common PCO (used NGS) *only vertical • Remove bias (shift PCV up/down) – not separable from clock error Elevation-dependent PCV

  11. Trimble Zephyr 2 (TRM55971.00) Differences in purely elevation-dependent PCV: • < 1 mm • L1 above 10 • L2 except for bump at 20 • < 2 mm for L1 & L2

  12. NGS Trimble Zephyr 2 (TRM55971.00)GPS L1 PCV with azimuth dependence Geo++ Bonn

  13. NGS Trimble Zephyr 2 (TRM55971.00)GPS L2 PCV with azimuth dependence Geo++ Bonn

  14. Trimble Zephyr 2 (TRM55971.00)GPS L1 PCV NGS 1 session Geo++ Bonn 10 sessions

  15. Trimble Zephyr 2 (TRM55971.00)GPS L2 PCV NGS 1 session Geo++ Bonn 10 sessions

  16. NGS – Bonn Trimble Zephyr 2 (TRM55971.00)GPS L1 differences Geo++ - Bonn NGS – Geo++

  17. Trimble Zephyr 2 (TRM55971.00)GPS L1 differences NGS – Bonn Geo++ - Bonn NGS – Geo++

  18. NGS – Bonn Trimble Zephyr 2 (TRM55971.00)GPS L2 differences Geo++ - Bonn NGS – Geo++

  19. Trimble Zephyr 2 (TRM55971.00)GPS L2 differences NGS – Bonn Geo++ - Bonn NGS – Geo++

  20. Trimble Zephyr 2Summary • Most of inter-method differences < 1 mm • Exceptions to the 1mm rule: • L1 below 10  elevation • L2 at ~ 20 elevation • All differences are < 2 mm (independent of azimuth and elevation)

  21. Trimble GNSS Chokering(TRM59800.00) Threeantenna samples tested

  22. 1 Trimble GNSS chokering(TRM59800.00) Serial # xxxx371

  23. 2 Trimble GNSS chokering(TRM59800.00) Serial # xxxx409

  24. 3 Trimble GNSS chokering(TRM59800.00) Serial # xxxx068

  25. GPS L1 elevation-dependent differences 1 3 2

  26. GPS L2 elevation-dependent differences 1 3 2

  27. 1 Trimble GNSS chokeringGPS L1 differences NGS – Bonn Geo++ - Bonn NGS – Geo++

  28. 2 Trimble GNSS chokeringGPS L1 differences NGS – Bonn Geo++ - Bonn NGS – Geo++

  29. 3 Trimble GNSS chokeringGPS L1 differences NGS – Bonn Geo++ - Bonn NGS – Geo++

  30. 1 Trimble GNSS chokeringGPS L2 differences NGS – Bonn Geo++ - Bonn NGS – Geo++

  31. 2 Trimble GNSS chokeringGPS L2 differences NGS – Bonn Geo++ - Bonn NGS – Geo++

  32. 3 Trimble GNSS chokeringGPS L2 differences NGS – Bonn Geo++ - Bonn NGS – Geo++

  33. 1 NGS – Bonn Trimble GNSS chokeringGPS L2 differences Geo++ - Bonn NGS – Geo++

  34. 2 NGS – Bonn Trimble GNSS chokeringGPS L2 differences Geo++ - Bonn NGS – Geo++

  35. 3 NGS – Bonn Trimble GNSS chokeringGPS L2 differences Geo++ - Bonn NGS – Geo++

  36. 1 Trimble GNSS chokeringGPS L2PCV NGS Geo++ Bonn

  37. 2 Trimble GNSS chokeringGPS L2 PCV NGS Geo++ Bonn

  38. 3 Trimble GNSS chokeringGPS L2 PCV NGS Geo++ Bonn

  39. Trimble GNSS ChokeringSummary • Excellent agreement for L1 (sub-mm) • Less ideal L2 agreement, differences are: • Systematic (same trends) • < 1 mm above 20 elevation (not 10) • < 2 mm in the 0-20range

  40. Topcon PG-A1 with groundplane(TPSPG_A1+GP)

  41. Elevation-dependent PCV Topcon PG-A1 (TPSPG_A1+GP)

  42. Topcon PG-A1 (TPSPG_A1+GP) Differences in purely elevation-dependent PCV: • Overall ± 2 mm • Extremely variable • Differences in L2 PCV are larger than PCV themselves

  43. NGS Topcon PG-A1 (TPSPG_A1+GP)GPS L1 PCV Geo++ Bonn

  44. NGS Topcon PG-A1 (TPSPG_A1+GP)GPS L2 PCV Geo++ Bonn

  45. Topcon PG-A1 (TPSPG_A1+GP)GPS L1 PCV NGS Geo++ Bonn

  46. Topcon PG-A1 (TPSPG_A1+GP)GPS L2 PCV NGS Geo++ Bonn

  47. NGS – Bonn Topcon PG-A1 (TPSPG_A1+GP)GPS L1 differences Geo++ - Bonn NGS – Geo++

  48. Topcon PG-A1 (TPSPG_A1+GP)GPS L1 differences NGS – Bonn Geo++ - Bonn NGS – Geo++

  49. NGS – Bonn Topcon PG-A1 (TPSPG_A1+GP)GPS L2 differences Geo++ - Bonn NGS – Geo++

  50. Topcon PG-A1 (TPSPG_A1+GP)GPS L2 differences NGS – Bonn Geo++ - Bonn NGS – Geo++

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