Future Satellite Gravimetry for Geodesy |
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| Authors: | J Flury R Rummel |
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| Institution: | 1. Institut für Astronomische und Physikalische Geod?sie, TU München, Germany
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| Abstract: | After GRACE and GOCE there will still be need and room for improvement of the knowledge (1) of the static gravity field at
spatial scales between 40 km and 100 km, and (2) of the time varying gravity field at scales smaller than 500 km. This is
shown based on the analysis of spectral signal power of various gravity field components and on the comparison with current
knowledge and expected performance of GRACE and GOCE. Both, accuracy and resolution can be improved by future dedicated gravity
satellite missions. For applications in geodesy, the spectral omission error due to the limited spatial resolution of a gravity
satellite mission is a limiting factor. The recommended strategy is to extend as far as possible the spatial resolution of
future missions, and to improve at the same time the modelling of the very small scale components using terrestrial gravity
information and topographic models.We discuss the geodetic needs in improved gravity models in the areas of precise height
systems, GNSS levelling, inertial navigation and precise orbit determination. Today global height systems with a 1 cm accuracy
are required for sea level and ocean circulation studies. This can be achieved by a future satellite mission with higher spatial
resolution in combination with improved local and regional gravity field modelling. A similar strategy could improve the very
economic method of determination of physical heights by GNSS levelling from the decimeter to the centimeter level. In inertial
vehicle navigation, in particular in sub-marine, aircraft and missile guidance, any improvement of global gravity field models
would help to improve reliability and the radius of operation. |
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| Keywords: | Geodesy gravity field heights GNSS levelling inertial navigation |
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