Accuracy and Reliability Improvement of Standalone High Sensitivity GPS Using Map Matching Techniques

C. Basnayake, G. Lachapelle

Abstract:	GPS is extensively used for a wide variety of navigation applications, ranging from personal navigation to real time data collection for Advanced Traveler Information Systems (ATIS). With the availability of street level maps with comparable accuracy, digital maps have become a major part in the user interface of many GPS applications in navigation and guidance. Apart from being a user interface component, high quality digital maps could also be used as an augmentation for vehicle-borne GPS. In this paper, an innovative map-matching algorithm is presented and analyzed as an augmentation for vehicleborne High Sensitive GPS (HSGPS) for traffic engineering applications. In contrast to conventional mapmatching techniques, the vehicle in consideration is modeled using a Kalman filter, which guides the mapping process using dynamic constraints of a land vehicle. The filter prediction capability is utilized to minimize the affects of short-term, moderate level multipath and shortterm degradation in GPS signals in urban canyons. The capabilities of the algorithm to handle momentary signal degradation and moderate, short-term multipath effects are presented. In order to avoid complications with digital map accuracy, a virtual digital road map of an urban area is built. A GPS simulator is used to simulate vehicles in the virtual road network. Controlled levels of multipath and GPS signal blockages are introduced to the simulated GPS receivers. The vehicle state estimates of HSGPS alone and map-matched HSGPS are compared against the simulated truth vehicle trajectories. The improvements made by the proposed algorithm are presented.
Published in:	Proceedings of the 59th Annual Meeting of The Institute of Navigation and CIGTF 22nd Guidance Test Symposium (2003) June 23 - 25, 2003 Hyatt Regency Hotel Albuquerque, NM
Pages:	209 - 216
Cite this article:	Basnayake, C., Lachapelle, G., "Accuracy and Reliability Improvement of Standalone High Sensitivity GPS Using Map Matching Techniques," Proceedings of the 59th Annual Meeting of The Institute of Navigation and CIGTF 22nd Guidance Test Symposium (2003), Albuquerque, NM, June 2003, pp. 209-216.
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