Environment Detection with Assisted GPS

Hanna Sairo, Jari Syrjarinne, Jarmo Takala

Abstract:	A method for detecting the GPS receiver environment is proposed. The objective is to recognize structural characteristics of the receiver environment in a manner that would alleviate the recognition of the location. The information about the receiver environment can be useful in detection of multipath conditions and, for instance, in emergency call positioning, when position information is vague. The topic is examined especially under wireless assisted GPS (AGPS) conditions. The basic idea of the environment detection is the comparison between the a priori information about the satellites and the currently visible satellites. Based on this idea and using the Dempster-Shafer theory, a reasoning system is developed. The functioning of the developed detection system is verified with Matlab simulations and with real GPS data, and the results are analyzed. The results state that the obtained information about the receiver environment is suggestive in nature, and does not describe the environment in detail. However, the obtained information about the environment was correct: the characteristics of the simulation locations were detected.
Published in:	Proceedings of the 58th Annual Meeting of The Institute of Navigation and CIGTF 21st Guidance Test Symposium (2002) June 24 - 26, 2002 Hyatt Regency Hotel Albuquerque, NM
Pages:	122 - 131
Cite this article:	Sairo, Hanna, Syrjarinne, Jari, Takala, Jarmo, "Environment Detection with Assisted GPS," Proceedings of the 58th Annual Meeting of The Institute of Navigation and CIGTF 21st Guidance Test Symposium (2002), Albuquerque, NM, June 2002, pp. 122-131.
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