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| Titel |
An Assessment of the Impact of Site Stability on the Absolute Gravity Record at the SGF, Herstmonceux, UK |
| VerfasserIn |
Victoria Smith, Matt Wilkinson, Rob Sherwood, Graham Appleby |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250056344
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| Zusammenfassung |
| Absolute gravimetry is an emerging geodetic technique that complements the established techniques of SLR, GNSS, DORIS and VLBI. Its strengths are sensitivity to vertical height variations as well as mass transfer. A permanently installed FG5 absolute gravimeter (AG) has been in operation at the NERC Space Geodesy Facility (SGF) at Herstmonceux, UK since 2006, and adds to the value of the long-established IGS HERS and HERT GNSS receivers and the ILRS HERL satellite laser ranging (SLR) system. Seasonal height variations, of amplitude approximately 1cm, are observed in the coordinates calculated from laser range observations of the geodetic satellites by the co-located SLR station, and could possibly be caused by local site motions. As such, the height changes should also manifest themselves as seasonal changes in the local acceleration due to gravity and be apparent in the time-series of regular absolute gravity measurements. Here we present the SGF up-to-date AG record with a preliminary analysis.
It is also possible on-site that relative motion at some level is occurring between the monuments of the SLR, AG and GNSS techniques. A program to monitor inter-technique height changes at the site has begun using a precise digital level. Additionally, potential site deformation is also monitored by exploiting the HERS, HERT and other regional GNSS receivers through short-baseline GPS solutions. We report here our findings on the stability of the Herstmonceux site in order to inform further comparisons of height change as measured by the three independent techniques, SLR, GPS and absolute gravimetry. |
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