Journal ArticleDOI
Improving the orbit estimates of GPS satellites
TLDR
The Extended Center for Orbit Determination in Europe (CODE) Orbit Model, an empirical orbit model proposed by Beutler and colleagues in 1994, has been tested extensively since January 1996 as mentioned in this paper.Abstract:
The Extended Center for Orbit Determination in Europe (CODE) Orbit Model, an empirical orbit model proposed by Beutler and colleagues in 1994, has been tested extensively since January 1996. Apart from six osculating Keplerian elements, this orbit model consists of nine (instead of the conventional two) parameters to take into account the deterministic part of the force field acting on the satellites. Based on the test results an improved orbit parameterization is proposed. The new orbit parameterization consists of the conventional two parameters plus three additional parameters, a constant and two periodic terms (a cosine and a sine term), in the X-direction to model the effects of the solar radiation pressure. Results based on one full year of routine orbit estimation, using the original and the new orbit parameterization, are presented to demonstrate the superiority of the new approach. An improvement of the orbit estimates with at least a factor of two is observed!read more
Citations
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Journal ArticleDOI
A New Solar Radiation Pressure Model for GPS Satellites
TL;DR: In this article, the authors present a solar radiation pressure model for the GPS satellites based on experiences and results gained at the Center for Orbit Determination in Europe (CODE) in the context of its IGS activities since June 1992.
Journal ArticleDOI
Galileo Orbit and Clock Quality of the IGS Multi-GNSS Experiment
Peter Steigenberger,Peter Steigenberger,Urs Hugentobler,Sylvain Loyer,Felix Perosanz,Lars Prange,Rolf Dach,Maik Uhlemann,Gerd Gendt,Oliver Montenbruck +9 more
TL;DR: This article analyzes the orbit and clock quality of the Galileo products of four MGEX analysis centers for a common time period of 20 weeks and finds that orbit comparisons of the individual analysis centers have a consistency at the 5–30 cm level.
Journal ArticleDOI
Estimation of elevation-dependent satellite antenna phase center variations of GPS satellites
Ralf Schmid,Markus Rothacher +1 more
TL;DR: In this article, a method for the estimation of the phase center variations of GPS satellite antennas using global GPS data is presented, which allows the creation of a consistent set of receiver and satellite antenna patterns and phase center offsets.
Journal ArticleDOI
Generalized Analytical Solar Radiation Pressure Modeling Algorithm for Spacecraft of Complex Shape
TL;DR: In this paper, the attitude behavior of specific classes of spacecraft and how these attitudes make it feasible to model radiation pressure effects in the spacecraft body-fixed coordinate system are explained, and the core mathematical and computational elements of the radiation pressure modeling algorithm are described.
Journal ArticleDOI
A unified analysis of crustal motion in Southern California, 1970-2004: The SCEC crustal motion map
Zheng-Kang Shen,Zheng-Kang Shen,Robert W. King,Duncan Carr Agnew,M. Wang,M. Wang,Thomas A. Herring,Danan Dong,Peng Fang +8 more
TL;DR: In this article, a series of solutions for station positions were derived from trilateration data collected from 1970 to 1992, VLBI data from 1979 to 1992 and GPS data from 1986 to 2004 to determine crustal motions in and around southern California.
References
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Extended orbit modeling techniques at the CODE processing center of the international GPS service for geodynamics (IGS): theory and initial results.
Gerhard Beutler,Elmar Brockmann,W. Gurtner,Urs Hugentobler,Leos Mervart,Markus Rothacher,Andreas Verdun +6 more
Journal ArticleDOI
Reduced-dynamic technique for precise orbit determination of low earth satellites
TL;DR: In this paper, a reduced-dynamic technique for precise orbit determination of low earth satellites is described, which optimally combines the conventional dynamic technique with the nondynamic technique which uses differential GPS continuous carrier phase to define the state transition.
Journal ArticleDOI
A new model for GPS yaw attitude
TL;DR: A new model for the GPS satellite yaw attitude is introduced that constitutes a significant improvement over the previously available model in terms of efficiency, flexibility and portability and the implementation of the yaw bias on the GPS satellites is reviewed.
Journal ArticleDOI
Apropos laser tracking to GPS satellites
TL;DR: The most important results of the analysis are that daily SLR station coordinate solutions could be generated with a few cm accuracy and the contribution of laser data on the `SLR-GPS' combined orbit is significant.