Advances in Radio Science www.adv-radio-sci.net 1684-9965 1684-9973 5 Kleinheubacher Berichte 2006 2007 10.5194/ars-5-367-2007 http://www.adv-radio-sci.net/5/367/2007/ http://www.adv-radio-sci.net/5/367/2007/ars-5-367-2007.html http://www.adv-radio-sci.net/5/367/2007/ars-5-367-2007.pdf 367 372 2007-06-13 Analysis of the impact of map-matching on the accuracy of propagation models M. Neuland neuland@ifn.ing.tu-bs.de T. Kürner Institute of Communications Technology, Braunschweig Technical University, Germany Propagation models are very important for the development and deployment of wireless communication networks. They are able to predict the path loss for different propagation conditions, but cannot include all propagation phenomena in detail. This fact leads to variations between predicted and measured field strengths. These variations can be reduced by calibrating some parameters of the propagation models with the help of exact measurement data. However, two problems occur when applying measurement data. On the one hand, the maps used for the prediction have only a limited resolution. On the other hand, the GPS data are erroneous due to the limited GPS accuracy and due to sampling errors. These errors can lead to variations up to 200 m between the measured positions and the possible positions on the road network. Therefore, a map-matching algorithm has to be applied which projects the wrong GPS positions automatically onto the street vectors used for the predictions. Thus, a good basis of data for calibration can be created. Brakatsoulas, S., Pfoser, D., Randall, S., and Wenk, C.: On Map-Matching Vehicle Tracking Data, Proceedings of the 31st International Conference on Very Large Data Bases, Trondheim, Norway, pp. 853–864, 30 August–2 September, 2005. Kürner, T. and Meier, A.: Prediction of Outdoor and Outdoor-to-Indoor Coverage in Urban Areas at 1.8~GHz, IEEE Journal on Selected Areas in Communications, vol. 20, no. 3, pp. 496–506, April, 2002. Marchal, F., Hackney, J., and Axhausen, K W.: Efficient map-matching of large GPS data sets – Tests on a speed monitoring experiment in Zurich, Arbeitsbericht Verkehrs- und Raumplanung, Institut fuer Verkehrsplanung und Transportsysteme, ETH Zürich, Zürich, 2004. Modsching, M., Kramer, R., and ten Hagen, K.: Field trial on GPS Accuracy in a medium size city: The influence of built-up, Proceedings of the 3rd Workshop of Positioning, Navigation and Communication, Hannover, Germany, pp. 209–218, 16 March, 2006. Pfoser, D. and Jensen, C S.: Capturing the Uncertainty of Moving-Object Representations, Proceedings of the 6th International Symposium on Advances in Spatial Databases, Hongkong, China, pp. 111–132, 20–23 July, 1999. Strutz, T.: Bilddatenkompression. Grundlagen, Codierung, MPEG, JPEG, Braunschweig/Wiesbaden: Vieweg, 2000.