Study On Indoor Location Technology Based On UWB

In recent years, with th e development of near field communication (NFC) and mobile technology, indoor lo cation-based services (LBS) has received considerable attention. Traditional indoor location t echnology such as in frared technology and Bluetooth technology ca nnot fully m eet users’need in system cost, stability, positioning accuracy and so on. The UWB technology becomes an excellent candidate for indoor location area because of its advantages such as high data rate, low-cost and high location accuracy. In addition, due to the multipath propagation and non-line of sight (NLOS) of com plex indoor environm ent, the high accuracy of indoor location algorithm is particularly necessary in the severe environment.Firstly the traditional wireless location methods and algorithms are been analyzed based on the research of UWB concepts and channel model in this paper. The location accuracy of existing position ing algorithm s can still be high in a s imple indoor environment, but with the deterioration of the environment, especially in the case of larger NLOS ranging error, the algorithm performance has been significantly reduced. But NLOS error is an im portant part ca nnot be ignored, because it relates to th e overall system precision. Around that prob lem, a novel Centroid -Taylor cooperative position scheme is proposed. The Centroid algorithm that is not sensitive to location error is used for initial rough location, and then the value of the rough location is used as the initial value of Taylor algorithm for precise positioning. It inverts the nodes that positioning completely into reference nodes. It can increase the quality of initial value for Taylor algorithm, also decrease the num ber of reference nodes in order to reduce system hardware costs.Simulation results show that this method has superior positioning perf ormance, especially the great im provement of system under the large rangi ng error caused by NLOS.