Site Surveys at HartRAO NERC Space Geodesy Facility, Herstmonceux ILRS Fall 2005 Workshop 3 October 2005 Ludwig Combrinck HartRAO Space Geodesy Programme.

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Presentation transcript:

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

Outer network for crustal stability

Intermediate Network

Inner network

Footprint network

More work

So a large team was sent to investigate

IGN/JPL/CDSM Survey July-August 2003

VLBI Antenna axis offset VLBI reference point is intersection of axes, or the projection point of the secondary axis onto the primary axis VLBI reference point is intersection of axes, or the projection point of the secondary axis onto the primary axis Axis offset determinations Axis offset determinations 1960 JPL engineering 6707 mm 1960 JPL engineering 6707 mm 1993 Conventional surveying mm (Mark Newling, CDSM) 1993 Conventional surveying mm (Mark Newling, CDSM) 1995 VLBI mm (Chopo Ma) 1995 VLBI mm (Chopo Ma) 1995 VLBI mm (Marshall Eubanks) 1995 VLBI mm (Marshall Eubanks) 1995 GPS mm (Ludwig Combrinck) 1995 GPS mm (Ludwig Combrinck) 1996 VLBI mm (Chopo Ma) 1996 VLBI mm (Chopo Ma) 2003 IGN mm (IGN/JPL/CDSM) 2003 IGN mm (IGN/JPL/CDSM)

2003; Total stations

2003 Method, TS and Matlab

GPS, own code

Typical Survey Pier

Repeatability? Different equipment (antennas etc) Different equipment (antennas etc) HRAO-SLR X Y Z (mm) HRAO-SLR X Y Z (mm) LC LC LC LC LC LC ITRF ITRF IGN IGN ~6.5cm ~4.5cm ~3.5cm ~6.5cm ~4.5cm ~3.5cm ~1.5cm ~1.5cm ~0.2cm ~1.5cm ~1.5cm ~0.2cm

Repeatability? Tie between VLBI and SLR Tie between VLBI and SLR X Y Z (M) X Y Z (M) ITRF ITRF ITRF ITRF GPS GPS ITRF ITRF IGN IGN ~8mm ~40mm ~4mm ~8mm ~40mm ~4mm ~2mm ~10mm ~10mm ~2mm ~10mm ~10mm

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