tailieunhanh - Báo cáo hóa học: " Research Article State Space Initiation for Blind Mobile Terminal Position Tracking"

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 State Space Initiation for Blind Mobile Terminal Position Tracking | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 394219 14 pages doi 2008 394219 Research Article State Space Initiation for Blind Mobile Terminal Position Tracking Vadim Algeier 1 Bruno Demissie 2 Wolfgang Koch 2 and Reiner Thoma1 1 Electronic Measurement Research Lab Institute of Information Technology Ilmenau University of Technology . Box 100 565 98684 Ilmenau Germany 2 Research Institute for Communication Information Processing and Ergonomics FKIE Research Establishment for Applied Science FGAN Neuenahrer Strafe 20 53343 Wachtberg Germany Correspondence should be addressed to Bruno Demissie demissie@ Received 23 April 2007 Accepted 19 September 2007 Recommended by Yvo Boers Blind localization and tracking of mobile terminals in urban scenarios is an important requirement for offering new locationbased services handling emergency cases of nonsubscribed users public safety countering IEDs and so forth. In this context we propose a track-before-detect scheme taking explicitly advantage of multipath propagation in an urban terrain by using a priori information about the known locations of the main scattering objects such as buildings. This information is made available for localization and tracking by a real-time ray tracing technique based on a 2D geographic database. This allows the prediction of the directional and temporal structure of the received multipath components for an arbitrary transmitter position. We consider a single observing station where the direction and the relative time of arrival of the received multipath components can be estimated by an antenna array. By a likelihood function which is algorithmically defined for a randomly distributed set of potential transmitter positions these measurements are compared with those being expected by ray tracing. This likelihood function is the key component of a track-before-detect scheme providing initial state estimates for mobile .