蓝牙连接模式对室内定位性能的影响

Influence of BLE connection mode on indoor positioning performance

基于低功耗蓝牙(BLE)接收信号强度标识(RSSI)测量的位置指纹定位是最常见和有效的室内定位方法之一。然而,BLE通信协议并非专门为定位而设计,不同通信连接方式下的蓝牙设备测距性能差异较大,显著影响着定位精度。针对这一问题,对不同连接模式下的BLE设备RSSI测距性能进行了测试和分析;进一步地,利用自行搭建的室内定位环境开展实验,验证了其对用户实际定位精度的影响。测试结果表明,当BLE模块设置为“不可连接模式”时,设备RSSI测距稳定性提高了约60%、用户在线定位精度由1.40 m提高到了0.58 m,能够获得明显更优的性能,是室内BLE定位系统的优选通信连接方式。

Fingerprinting location based on received signal strength indication(RSSI)of Bluetooth low energy(BLE)is one of the most popular and effective indoor positioning methods.However,the BLE communication protocol is not specifically designed for location,and the ranging performance of the Bluetooth devices under different communication connection modes varies greatly,which significantly affects the positioning accuracy.In response to this problem,the paper tests and analyzes the BLE RSSI ranging performance under different connection modes.Further,experiments based on a self-built indoor positioning environment are carried out to verify its impact on the user′s actual positioning accuracy.The test results show that when the BLE module is set to"un-connectable mode",the RSSI ranging stability of the device is improved by about 60%,and the user′s online positioning accuracy is improved from 1.40 m to 0.58 m,which significantly improve the positioning performance.