一种基于蓝牙信标的室内定位系统

针对室内定位与导航服务的应用需求,使用蓝牙信标节点,构建了一种米级室内定位系统.设计了一种基于CC2540F256的蓝牙4.0信标节点,采用优化均匀部署方法完成信标的布设,在此基础上配置信标BLE协议栈进行位置标识;在安卓平台下搭建定位终端,利用三角质心定位方法实现位置估计.该系统在传统RSSI定位方法的基础上,加入阶段去噪与平滑滤波过程,用于提高测距准确度和稳定性.在实验室楼道测试环境下,平均定位精度可达1.5m,具有布设方便、功耗低和绿色环保的特点.

An Indoor Positioning System Based on Bluetooth Beacons

According to the application requirements of indoor positioning and navigation services,an indoor meter-level positioning system based on Bluetooth beacons node is built.A kind of Bluetooth 4.0 beacon with CC2540F256 core is designed.These beacons are deployed optimally and uniformly,then the beacon''s protocol stack is configured as a location tag.A kind of positioning terminal is built on Android platform,which achieves the position estimation with three triangle centroid location algorithm.The system adds a stage de-noising and smooth-filtering process into the traditional RSSI positioning method to improve the accuracy and stability of ranging.Experiment results show that the average positioning accuracy is up to 1.5 m in the laboratory corridor,which results in high reliability,low power consumption and environmental protection.