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Efficient LEO Dynamic Orbit Determination with Triple Differenced GPS Carrier Phases

Published online by Cambridge University Press:  20 April 2007

Tae-Suk Bae ,
Dorota Grejner-Brzezinska  and
Jay Hyoun Kwon
Tae-Suk Bae
Affiliation:
(The Ohio State University) (Email: [email protected])
Dorota Grejner-Brzezinska
Affiliation:
(The Ohio State University) (Email: [email protected])
Jay Hyoun Kwon
Affiliation:
(The University of Seoul)
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Abstract

The dynamic precise orbit determination of a Low Earth Orbit satellite using triple differenced GPS phases is presented in this study. The atmospheric drag parameters are estimated to compensate the incomplete atmosphere model for better precision of the orbit solution. In addition, the empirical force parameters, especially once- and twice-per-revolution components, along with the new IERS Conventions and models to compute the perturbing forces are introduced to absorb the remaining unmodelled forces. The optimal arc length for the parameterization and the data processing strategy are also tested and analyzed for the best orbit solutions. The triple differencing technique enables fast and efficient orbit estimation, because no ambiguity resolution and cycle slip detection are required. With the triple differenced ion-free GPS phase observables, the orbit and the velocity solutions for 24 hours of CHAMP are calculated; they compare with the published Rapid Science Orbit with the accuracy of 8 cm and 0·12 mm/s in 3D RMS for the orbit and the velocity, respectively, and are statistically consistent with the RSO when it is not better than 4 cm in terms of an absolute accuracy. The approach presented here provides an efficient and simple, but robust, alternative approach, while the solution's accuracy is still comparable to the double-difference results.

Keywords

LEODynamic PODTriple difference
Type
Research Article
Information
The Journal of Navigation , Volume 60 , Issue 2 , May 2007 , pp. 217 - 232
Copyright
Copyright © The Royal Institute of Navigation 2007

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