Research And Implementation Based On The Indoor Bluetooth Positioning System

The indoor positioning technology based on Beacon,a Bluetooth device,has been extensively applied and studied since Apple Inc.released it in 2013 and firstly applied Bluetooth technology and position fingerprint technology into the indoor positioning system.This thesis,through studying and analyzing the indoor positioning system based on Bluetooth technology,proposes a kind of triangle positioning algorithm on the basis of three-point localization and coordinate weighting as well as a Bluetooth positioning system based on distributed indoor distribution system.Specific research of this thesis is as follows:(1)This thesis mainly studies the triangle positioning algorithm.Targeted at the fact that in practical positioning environment,three circles consisting of three Bluetooth Beacon nodes intersect at multiple points instead of one,the thesis proposes a kind of triangle positioning algorithm on the basis of three-point localization and coordinate weighting.In this algorithm,the RSSI data obtained firstly go through Kalman Filtering processing to reduce its volatility.Then,three different RSSI selection modes are conducted for the RSSI data set after Kalman Filtering processing to get proper RSSI data and implement three-point localization algorithm,thereby gaining three positioning results close to actual nods to be positioned and having coordinate weighting for these three positioning results.The weight is determined based on the error between the positioning results obtained through these three selective modes and the actual positioning node localizations.At last,the final positioning results are obtained and output through conducting triangle positioning computation for the three weighted coordinates after weighting the coordinates.(2)This thesis studies and analyzes the existing indoor positioning system based on Bluetooth.Targeted at the problems of the indoor positioning system based on Bluetooth such as inconvenient remote operation and management,battery death and failure,extra Bluetooth gateway placement,etc.,an indoor Bluetooth positioning system based on distributed indoor distribution system is proposed,which connects Beacon in the radiofrequency coverage unit of the far end of the existing distributed based station.Besides,the Bluetooth background management system is designed and implemented in the server.Straight power is supplied to Beacon through wired connection,which solves the maintenance problem that the staff need to go to the scene to change dead batteries.In the meantime,due to the fine indoor communication signal coverage of the existing distributed base station,remote management and monitoring of the Bluetooth devices is realized without extra deployment of Bluetooth gateway,due to which the cost of deployment and maintenance is reduced.According to the experiment and test,the average positioning error of the triangle positioning algorithm based on three-point localization and coordinate weighting proposed in this thesis is 0.880 m.After testing the Bluetooth positioning system designed in this thesis,it is shown that the positioning accuracy of this system is 3.63 m in static test and 1.335 m in dynamic test.