Rapid orbit determination of LEO satellites using IGS clock and ephemeris products |
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| Authors: | Oliver Montenbruck Eberhard Gill Remco Kroes |
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| Institution: | 1. German Space Operations Center, Deutsches Zentrum für Luft- und Raumfahrt, 82230, We?ling, Germany
2. Department of Earth Observation and Space Systems, Delft University of Technology, 2629, HS, Delft, The Netherlands
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| Abstract: | Different types of GPS clock and orbit data provided by the International GPS Service (IGS) have been used to assess the accuracy
of rapid orbit determination for satellites in low Earth orbit (LEO) using spaceborne GPS measurements. To avoid the need
for reference measurements from ground-based reference receivers, the analysis is based on an undifferenced processing of
GPS code and carrier-phase measurements. Special attention is therefore given to the quality of GPS clock data that directly
affects the resulting orbit determination accuracy. Interpolation of clock data from the available 15 min grid points is identified
as a limiting factor in the use of IGS ultra-rapid ephemerides. Despite this restriction, a 10-cm orbit determination accuracy
can be obtained with these products data as demonstrated for the GRACE-B spacecraft during selected data arcs between 2002
and 2004. This performance may be compared with a 5-cm orbit determination accuracy achievable with IGS rapid and final products
using 5 min clock samples. For improved accuracy, high-rate (30 s) clock solutions are recommended that are presently only
available from individual IGS centers. Likewise, a reduced latency and more frequent updates of IGS ultra-rapid ephemerides
are desirable to meet the requirements of upcoming satellite missions for near real-time and precise orbit determination. |
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| Keywords: | Orbit determination GPS LEO satellites GRACE |
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