针对在人群密集区域人员管控追踪搜查问题,设计一款基于WiFi探针的便携式追踪器。首先,选用两块ESP8266芯片进行硬件电路设计。其次,通过对ESP8266芯片软件编码,可以捕获手机发出的802.11探针包,且可以进行WiFi联网传输。再次,通过解析探针包可获得手机的MAC地址以及信号强度。最后,将采集的探针数据RSSI转换为距离,即可实时获得目标用户的方圆位置,追踪器可以判断一定范围内是否存在目标人物。此外,追踪器搭配蓝牙、WiFi、GPRS等通信模块可以将探测到的数据发送至用户手机或者远程服务器。WiFi探针追踪器硬件成本低且使用简单,可以较好地应用于人员追踪溯源领域。

Aiming at the problem of tracking and searching people in crowded areas,a portable tracker based on WiFi probe is designed.Firstly,two ESP8266 chips are selected for hardware circuit design.Secondly,the author can capture the 802.11 probe packet sent by the mobile phone by coding the ESP8266 chip software,and can perform WiFi network transmission.Thirdly,the author can obtain the MAC address and signal strength of the mobile phone after analyzing the probe packet.Finally,the author converts the collected probe data RSSI into distance,so that the location of the target user can be obtained in real time,and the tracker can determine whether there is a target person within a certain range.In addition,the tracker is equipped with communication modules such as Bluetooth,WiFi,GPRS,etc.,which can send the detected data to the user's mobile phone or a remote server.The WiFi probe tracker has low hardware cost and is easy to use,and can be better applied to the application field of personnel tracking and traceability.