Research On TOA Location Method Based On Uwb Wireless Sensor Networks

Ultra-wideband wireless sensor networks with some of the traditional wireless sensor networks unmatched advantages,is a candidate technology for future wireless sensor network applications.This thesis presents TOA based location technology advantage,and analyzes TOA based location method in the error performance.TOA estimation algorithm based on energy detection don't need precise local template to achieve low complexity. According to analysis and comparison for several existent TOA estimation algorithm based on energy detection, we found that TC(threshold-crossing) algorithm normalized threshold is set based on the MMR of the energy samples is superior to others on performance.An improved TOA estimation algorithm combined with optimized Early-late Gate signal processing based on MMR-TC algorithm is proposed.The simulation results show that improved MMR-TC algorithm compared with a single MMR-TC algorithm to further improve the location accuracy.