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定位技术自出现以来在人们的工作生活中起着不可或缺的作用。目前常见的定位技术有GPS定位,基站定位,Wi Fi定位等。GPS由于信号穿透力较弱,当用户处于室内信号被遮挡时,定位不准确。基站定位基于运营商的网络,通过测量附近多个基站的信号得到用户的位置,但是精度较低。目前主流的Wi Fi定位技术是通过设备扫描并收集周围的AP信息然后发送至位置服务商,服务器检索这些AP的物理地址并通过信号强度计算出设备的位置,这种技术要求位置服务商不断采集AP最新数据并更新自己的数据库以保证数据的实时性和准确性,而如何以较低成本达到方便准确的室内Wi Fi定位是人们日益重视的问题。
Positioning technology has played an indispensable role in people’s work and life since its inception. The current common positioning technology GPS positioning, base station positioning, Wi Fi positioning. GPS because the signal penetration is weak, when the user is in the room signal is blocked, the positioning is not accurate. Base station positioning is based on the carrier’s network, which obtains the user’s location by measuring the signals from nearby base stations, but with less accuracy. At present, mainstream Wi Fi positioning technology scans and collects surrounding AP information by devices and sends them to a location service provider. The server retrieves the physical addresses of these APs and calculates the location of the device by signal strength. This technique requires the location service provider to continuously collect AP latest data and update their database to ensure the real-time data and accuracy, and how to achieve convenient and accurate indoor Wi Fi positioning at a lower cost is an issue of increasing importance.