1 / 17

Site Surveys at HartRAO

Site Surveys at HartRAO. NERC Space Geodesy Facility, Herstmonceux ILRS Fall 2005 Workshop 3 October 2005 Ludwig Combrinck HartRAO Space Geodesy Programme. Footprints and Ties. Outer network Intermediate network Inner network 2000 micro network VLBI antenna offset

yori
Download Presentation

Site Surveys at HartRAO

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Site Surveys at HartRAO NERC Space Geodesy Facility, HerstmonceuxILRS Fall 2005 Workshop3 October 2005 Ludwig Combrinck HartRAO Space Geodesy Programme

  2. Footprints and Ties • Outer network • Intermediate network • Inner network • 2000 micro network • VLBI antenna offset • Ties between geodetic systems i.e. VLBI, SLR, GPS, DORIS

  3. Outer network for crustal stability

  4. Intermediate Network

  5. Inner network

  6. Footprint network

  7. More work

  8. So a large team was sent to investigate

  9. IGN/JPL/CDSM Survey July-August 2003

  10. VLBI Antenna axis offset • VLBI reference point is intersection of axes, or the projection point of the secondary axis onto the primary axis • Axis offset determinations • 1960 JPL engineering 6707 mm • 1993Conventional surveying 6695 +- 3 mm (Mark Newling, CDSM) • 1995 VLBI 6693.6 +-2.5 mm (Chopo Ma) • 1995 VLBI 6692.5 +- 1.5 mm (Marshall Eubanks) • 1995 GPS 6695.6 +- 2.3 mm (Ludwig Combrinck) • 1996 VLBI 6688.8 +- 1.8 mm (Chopo Ma) • 2003 IGN 6695 +- 2.5 mm (IGN/JPL/CDSM)

  11. 2003; Total stations

  12. 2003 Method, TS and Matlab

  13. GPS, own code

  14. Typical Survey Pier

  15. Repeatability? • Different equipment (antennas etc) • HRAO-SLR X Y Z (mm) LC 1998 48554.3 65628.3 42835.7 LC 1998 48552.2 65628.8 42837.1 LC 1999 48556.2 65626.4 42834.7 ITRF 2000 48619 65574 42797 IGN 2003 48635.3 65591.8 42799.2 ~6.5cm ~4.5cm ~3.5cm ~1.5cm ~1.5cm ~0.2cm

  16. Repeatability? • Tie between VLBI and SLR X Y Z (M) ITRF 1993 41.634 -66.597 -8.169 ITRF 1994 41.652 -66.620 -8.187 GPS 1995 41.680 -66.564 -8.131 ITRF 2000 41.672 -66.606 -8.135 IGN 2003 41.674 -66.596 -8.145 ~8mm ~40mm ~4mm ~2mm ~10mm ~10mm

  17. Conclusions • Last survey closer to ITRF eccentricities • Last word has not been spoken……

More Related