I: PRECISE ORBIT DETERMINATION AND GRAVITY FIELD MODELLING: Strategies for Precise Orbit Determination of Low Earth Orbiters Using the GPS |
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Authors: | Hugentobler U Beutler G |
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Institution: | (1) Astronomical Institute, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland |
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Abstract: | Considerable experience accumulated during the past decade in strategies for processing GPS data from ground-based geodetic
receivers. First experience on the use of GPS observations from spaceborne receivers for orbit determination of satellites
on low altitude orbits was gained with the launch of TOPEX/POSEIDON ten years ago. The launch of the CHAMP satellite in July
2000 stimulated a number of activities worldwide on improving the strategies and algorithms for orbit determination for Low
Earth Orbiters (LEOs) using the GPS.
Similar strategies as for ground-based receivers are applied to data from spaceborne GPS receivers to determine high precision
orbits. Zero- and double-differencing techniques are applied to obtain kinematic and/or reduced-dynamic orbits with an accuracy
which is today at the decimeter level. Further developments in modeling and processing strategies will continuously improve
the quality of GPS-derived LEO orbits in the near future. A significant improvement can be expected from fixing double-difference
phase ambiguities to integer numbers. Particular studies focus on the impact of a combined processing of LEO and GPS orbits
on the quality of orbits and the reference frame realization.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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