Constrained GPS Precise Orbit Determination for Low-Earth-Orbiters

M. Mander, York University

Abstract:	The degradations in accuracy of GPS precise orbit determination solutions for Low Earth Orbiters (LEOs) are analyzed under various constraints in this study. The constrained solutions are compared against a reference solution that is determined by post-processing dualfrequency data from the CHAllenging Mini-Satellite Payload (CHAMP). The constraints explored in this study are real-time processing requirements, availability of only single-frequency data, limited power onboard the LEO and limited CPU onboard the LEO. For the post-processing case, the longer the time that the receiver collects data, the more accurate the solution. This is not the case for real-time processing. In the case of post-processing, switching from single-frequency to dualfrequency data improves the orbit accuracy quite significantly in contrast to real-time processing. In the case of a limited CPU for real-time processing, altering the complexity of the dynamic models does not affect the accuracy with much significance.
Published in:	Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010) September 21 - 24, 2010 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	2789 - 2796
Cite this article:	Mander, M., University, York, "Constrained GPS Precise Orbit Determination for Low-Earth-Orbiters," Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010), Portland, OR, September 2010, pp. 2789-2796.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In