GPS inferred geocentric reference frame for satellite positioning and navigation |
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| Authors: | Rajendra P Malla WU Sien-Chong |
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| Institution: | (1) Jet Propulsion Laboratory, California Institute of Technology, Mail Stop 238-640, 91109 Pasadena, CA, (U.S.A.);(2) Present address: Sterling Software, Pasadena, CA |
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| Abstract: | Accurate geocentric three dimensional positioning is of great importance for various geodetic and oceanographic applications.
While relative positioning accuracy of a few centimeters has become a reality using Very Long Baseline Interferometry (VLBI), the uncertainty in the offset of the adopted coordinate system origin from the geocenter is still believed to be of the
order of one meter. Satellite Laser Ranging (SLR) is capable of determining this offset to better than10 cm, though, because of the limited number of satellites, this requires a long arc of data. The Global Positioning System (GPS) measurements provide a powerful alternative for an accurate determination of this origin offset in relatively short period
of time. Two strategies are discussed, the first utilizes the precise relative positions predetermined byVLBI, where as the second establishes a reference frame by holding only one of the tracking sites longitude fixed. Covariance
analysis studies indicate that geocentric positioning to an accuracy of a few centimeters can be achieved with just one day
of preciseGPS pseudorange and carrier phase data. |
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