Kalman-filter-based GPS clock estimation for near real-time positioning |
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| Authors: | André Hauschild Oliver Montenbruck |
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| Institution: | (1) German Space Operations Center (GSOC), Deutsches Zentrum für Luft-und Raumfahrt (DLR), 82234 Wessling , Germany |
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| Abstract: | In this article, an algorithm for clock offset estimation of the GPS satellites is presented. The algorithm is based on a
Kalman-filter and processes undifferenced code and carrier-phase measurements of a global tracking network. The clock offset
and drift of the satellite clocks are estimated along with tracking station clock offsets, tropospheric zenith path delay
and carrier-phase ambiguities. The article provides a brief overview of already existing near-real-time and real-time clock
products. The filter algorithm and data processing scheme is presented. Finally, the accuracy of the orbit and clock product
is assessed with a precise orbit determination of the MetOp satellite and compared to results gained with other real-time
products.
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| Keywords: | Clock estimation Precise orbit determination Real-time Kalman filter |
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