Absolute phase center corrections of satellite and receiver antennas |
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Authors: | Ralf Schmid Markus Rothacher Daniela Thaller Peter Steigenberger |
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Institution: | 1. Institut für Astronomische und Physikalische Geod?sie, Technische Universit?t München, 80290, Munich, Germany 2. Forschungseinrichtung Satellitengeod?sie, Technische Universit?t München, 80290, Munich, Germany
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Abstract: | Results of the estimation of azimuth-dependent phase center variations (PCVs) of GPS satellite antennas using global GPS data
are presented. Significant variations of up to ±3–4 mm that are demonstrated show excellent repeatability over eight years.
The application of the azimuthal PCVs besides the nadir-dependent ones will lead to a further reduction in systematic antenna
effects. In addition, the paper focuses on the benefit of a possible transition from relative to absolute PCVs. Apart from
systematic changes in the global station coordinates, one can expect the GPS results to be less dependent on the elevation
cut-off angle. This, together with the significant reduction of tropospheric zenith delay biases between GPS and VLBI, stands
for an important step toward more consistency between different space geodetic techniques. |
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Keywords: | Satellite antenna Phase center variations Tropospheric zenith delay Elevation cut-off |
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