tailieunhanh - Báo cáo hóa học: "Research Article Performance Capabilities of Long-Range UWB-IR TDOA Localization Systems"

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 Performance Capabilities of Long-Range UWB-IR TDOA Localization Systems | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 236791 17 pages doi 2008 236791 Research Article Performance Capabilities of Long-Range UWB-IR TDOA Localization Systems Richard J. Barton1 and Divya Rao2 1 Engineering Research and Consulting Inc. NASA Johnson Space Center Houston TX 77058 USA 2 Cisco Systems Inc. San Jose CA 95134 USA Correspondence should be addressed to Richard J. Barton Received 11 March 2007 Accepted 26 October 2007 Recommended by Venugopal V. Veeravalli The theoretical and practical performance limits of a 2D ultra-wideband impulse-radio localization system operating in the far field are studied under the assumption that estimates of location are based on time-difference-of-arrival TDOA measurements. Performance is evaluated in the presence of errors in both the TDOA measurements and the sensor locations. The performance of both optimal maximum-likelihood and suboptimal location estimation algorithms is studied and compared with the theoretical performance limit defined by the Cramer-Rao lower bound on the variance of unbiased TDOA location estimates. A novel weighted total-least-squares algorithm is introduced that compensates somewhat for errors in sensor positions and reduces the bias in location estimation compared with a widely used weighted least-squares approach. In addition although target tracking per se is not considered in this paper performance is evaluated both under the assumption that sequential location estimates are not aggregated as well as under the assumption that some sort of tracker is available to aggregate a sequence of estimates. Copyright 2008 R. J. Barton and D. Rao. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Ultra-wideband UWB impulse radio IR .