Altitude Hold Algorithm for ILL-Conditioned GPS Positioning

C-W. Chen, L-S. Wang, F-R. Chang, and C-C. Chen

Abstract:	To deal with the ill-conditioned GPS positioning problem in which the number of satellites is dropped below four, the altitude-hold algorithm is proposed in this paper. The Earth's ellipsoidal model is used to derive the relation between the infinitesimal change of altitude and those of rectangular coordinates so that the altitude information can be incorporated into the positioning equation directly. If, furthermore, the motion is assumed to be of constant altitude within a short interval of time, the averaged value of the altitudes estimated in regular phase may be used to provide the altitude information which results in the altitude-hold algorithm. From the simulation and experimental results, it is seen that the proposed algorithm can enhance the reliability of the positioning significantly.
Published in:	Proceedings of the 2006 National Technical Meeting of The Institute of Navigation January 18 - 20, 2006 Hyatt Regency Hotel Monterey, CA
Pages:	278 - 282
Cite this article:	Chen, C-W., Wang, L-S., Chang, F-R., Chen, C-C., "Altitude Hold Algorithm for ILL-Conditioned GPS Positioning," Proceedings of the 2006 National Technical Meeting of The Institute of Navigation, Monterey, CA, January 2006, pp. 278-282.
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