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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article The Effect of Cooperation on Localization Systems Using UWB Experimental Data | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 513873 11 pages doi 10.1155 2008 513873 Research Article The Effect of Cooperation on Localization Systems Using UWB Experimental Data Davide Dardari 1 Andrea Conti 2 Jaime Lien 3 and Moe Z. Win4 1 WiLAB University of Bologna Viale Risorgimento 2 40136 Bologna Italy 2ENDIF and WiLAB University of Ferrara Via Saragat 1 44100 Ferrara Italy 3 Jet Propulsion Laboratory 4800 Oak Grove Drive Pasadena CA 91109 USA 4 Laboratory for Information and Decision Systems LIDS Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 USA Correspondence should be addressed to Andrea Conti a.conti@ieee.org Received 1 September 2007 Accepted 21 December 2007 Recommended by Erchin Serpedin Localization systems based on ultrawide bandwidth UWB technology have been recently considered for indoor environments due to the property of UWB signals to resolve multipath and penetrate obstacles. However line-of-sight LoS blockage and excess propagation delay affect ranging measurements thus drastically reducing the localization accuracy. In this paper we first characterize and derive models for the range estimation error and the excess delay based on measured data from real ranging devices. These models are used in various multilateration algorithms to determine the position of the target. Using measurements in a real indoor scenario we investigate how the localization accuracy is affected by the number of beacons and by the availability of priori information about the environment and network geometry. We also examine the case where multiple targets cooperate by measuring ranges not only from the beacons but also from each other. An iterative multilateration algorithm that incorporates information gathered through cooperation is then proposed with the purpose of improving the localization accuracy. Using numerical results we demonstrate the impact of cooperation on the .
