Research of hybrid positioning method based on mine WiFi communication system
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摘要: 分析了现有矿井目标定位方法原理及存在的问题:非测距定位中的基于射频识别技术的定位方法、基于蜂窝小区标识的定位方法和无线传感器网络定位方法只能确定目标节点的范围,定位精度较差;测距定位精度较高,但基于到达角度的定位方法、基于到达时间的定位方法和基于到达时间差的定位方法对硬件设备要求较高,难以在煤矿井下应用;基于接收信号强度的定位方法易于实现,但受环境噪声影响较大,定位精度降低。提出了一种基于矿井WiFi通信系统的混合定位方法,该方法分粗细两步进行定位:粗定位采用基于蜂窝小区标识的非测距定位方法,确定目标所在的小区范围;细定位采用基于接收信号强度的测距定位方法。该混合定位方法可以在不增加定位系统复杂度的情况下提高目标定位的精度。Abstract: The paper analyzed principles of current mine target positioning methods and their existed problems: range-free positioning can only determine range of targe nodes, so it has low positioning precision, such as positioning methods based on radio frequency identification, beehive cell identification and wireless sensor network. Range-based positioning has higher positioning precision, but positioning methods based on angle of arrival, time of arrival and time difference of arrival have higher requirements for hardware devices and are difficult to applied in coal mine underground; positioning method based on received signal strength indication is easy to realize but its positioning precision would reduce due to influence of environmental noise. The paper proposed a hybrid positioning method based on mine WiFi communication system. The method includes coarse positioning and fine positioning: coarse positioning uses range-free positioning method based on beehive cell identification to determine area range of target; fine positioning uses range-based positioning method based on received signal strength indication. The method can improve positioning precision of target without increasing complexity of positioning system.
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