Analysis of Pseudolite Augmentation for GPS Airborne Applications

Hung Kyu Lee, Jinling Wang, Chris Rizos, Joel Barnes, Toshiaki Tsujii andBen K.H. Soon

Abstract:	The Satellite Navigation and Positioning Group (SNAP) at the University of New South Wales has recently been involved in developing integrated GPS and pseudolite systems for airborne applications, such as for airborne mapping, aircraft automatic landing, and positioning and navigation services using high altitude platforms. To efficiently implement such ground-based pseudolite augmentation for GPS airborne applications, there are some technical issues which need to be investigated. For instance, not only should two antenna offsets (one on the top of, and the other underneath, the platform) be corrected for, but the number, the location, and the geometric distribution of the pseudolites on the ground has to be carefully considered. Initial analyses have shown that the accuracy requirement for the attitude parameters is dependent on the magnitude of the offsets between the two antennas. In addition, a series of simulations has demonstrated that pseudolite augmentation can significantly improve the quality of the positioning solutions. Especially in such airborne applications, the vertical component accuracy was increased due to negative elevation of the pseudolite(s). In the long term, the optimal number and locations of the pseudolites are dependent on the satellite geometry. Based on selected optimization criteria, a comprehensive search is needed for a specific application. A geometric analysis and measurement testing procedure for this purpose will also be presented.
Published in:	Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002) September 24 - 27, 2002 Oregon Convention Center Portland, OR
Pages:	2610 - 2618
Cite this article:	Lee, Hung Kyu, Wang, Jinling, Rizos, Chris, Barnes, Joel, Soon, Toshiaki Tsujii andBen K.H., "Analysis of Pseudolite Augmentation for GPS Airborne Applications," Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002), Portland, OR, September 2002, pp. 2610-2618.
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