基于BLE Mesh的资产定位系统设计

Design of assets positioning system based on BLE mesh

针对当前资产定位系统定位精度、建设成本和部署灵活性难以有效平衡的问题,基于BLE Mesh采用多维标度分析(MultiDimensional Scaling-Map,MDS-MAP)定位算法设计了一种资产定位系统。系统首先对原始接收信号强度(Received Signal Strength Indicator,RSSI)进行高斯-卡尔曼融合滤波,提高了RSSI值的准确性;然后利用生存时间(Time To Live,TTL)对中继节点进行约束,提高了数据传输的有效性;最后利用半径弥补法与Bellman-Ford融合迭代方案对生成的距离矩阵进行修正,减小了测距误差。实验结果表明,所设计的系统可有效完成蓝牙标签信息更新以及位置展示,平均定位精度达到了0.94 m。本系统具有成本低、工程实施方便的优点,有一定的应用价值和发展前景。

It is difficult to effectively balance the positioning accuracy,construction cost,and deployment flexibility of the current asset positioning system.To address this challenge,this paper designs an asset positioning system based on bluetooth low energy(BLE)mesh using multidimensional scaling-map(MDS-MAP)positioning algorithm.Firstly,the original received signal strength indicator(RSSI)value is filtered by Gauss-Kalman fusion to improve its accuracy.Then,time to live(TTL)is used to restrict the relay nodes,which improves the data transmission efficiency.Finally,in order to reduce the ranging error,the range matrix is modified by using the radius compensation method and the Bellman-Ford fusion iteration scheme.The experimental results show that the designed system can effectively update the bluetooth tag information and display the location,and the average positioning accuracy reaches 0.94 m.This system has the advantages of low cost and convenient engineering implementation,and has certain application value and development prospect.