Research On Signal Mobile Network Based Acquisition System And Positioning Algorithm

Currently,with the support of the four supporting global satellite navigation system,the outdoor location services have been widely used in people's lives.More and more people's daily lives is in indoor environment.With the modernization of the cities,the number of large buildings is rapidly increasing,and the requirement of indoor LBS is dramatically increasing.GNSS can't be used in indoor positioning,because its' signal is too weak.Nowadays,indoor positioning systems are based on Wi-Fi,Zigbee,UWB(Ultra Wide Band)and so on.However the coverage of these systems is too small,which makes the cost of indoor LBS is too much.So the indoor LBS application is hard to be popularized now.Mobile base station has wide indoor signal coverage,so,the indoor LBS can be popularized if the problem of high precision indoor positioning based on mobile base station be solved.This dissertations part of the national high technology research and development plan "The demonstration of key technology and service on indoor and outdoor high precision navigation and positioning,conducting in-depth research on design and implementation of systems for information collection feature,and thoroughly study on indoor positioning algorithms based on TDOA(Time Difference of Arrival)and RSSI(Received Signal Strength)information.Firstly,study the existing indoor wireless positioning method,give the relevant derivation process,and introduce the criteria of the main factors affecting indoor location and indoor positioning.Secondly,design and implement the feature location collection system.Combine the TDOA and RSSI Indication for feature information of wide-area indoor positioning collection system.Complete the collection processing and storage of location information on the characteristics,work.And present a fast and efficient path for filtering locating information.Thirdly,Propose indoor location algorithm based on TDOA and RSSI information,describe the algorithm implementation process,and derivate the process of the algorithm.The algorithm uses the feature point error to compensate for the anchor point location information,and calculates the position of the current anchor points by compensated information utilization positioning.Proposed algorithm based indoor positioning system additions to compensate for the base station location and positioning coverage holes.Finally,analysis the algorithm simulation,and this algorithm can reach level meter indoor positioning accuracy.