WLAN Probe Request Frame Based Indoor Location-Aware Method

More and more operators and businesses deploy WLAN(mainly WiFi),coupled with the LBS service business model increasingly clear,WiFi positioning has become the current mainstream indoor positioning technology.But the existing WLAN positioning technology needs to connect WiFi network,and pre-install positioning software,not cross-platform,which undoubtedly increased the positioning of the cumbersome.This can cause incalculable consequences when the user can not participate in positioning(such as trapped by a fire,trapped by a mine,etc.).Therefore,the study of WiFi-free connection,no need to install the software,without user participation,cross-platform indoor positioning method,has become a critical problem to be solved.Aiming at the complicated indoor environment of shopping malls and underground parking lots,this paper proposed a sensing location method based on WLAN probe request frame.By monitoring the Probe Request frame transmitted between devices in the WLAN coverage area,achieving the positioning goal without connecting to the WiFi.On this basis,by the use of Web technology and distributed technology,achieving cross-platform positioning goal without installing positioning software.The main research work of this paper is as follows:(1)This paper discussed the positioning method and its feasibility of WLAN probe request frame as indoor positioning index.Through the monitoring and capture of WLAN probe request frame,the real-time performance of positioning metadata is ensured,and the device does not need to install the sensing software.(2)In this paper,the location solver system based on the trilateration localization algorithm was constructed and deployed in the cloud,which realizes the aim of the device without installing the location solution software.The location calculation process is carried out in the cloud,without the need for the user to install the location calculation software,and the positioning result is transmitted to the user through the network.(3)In this paper,we used Web technology and distributed architecture to decouple the positioning system,and finally form the positioning scheme without connecting WiFi,without installing software and cross-platform.The positioning process does not require user participation,can be used for positioning and navigation,and can also be used for passive monitoring.(4)Based on the above research results,a cross-platform indoor sensing location prototype system based on WLAN probe request frame was developed.Then we select a typical indoor area,from the frame capture and analysis,positioning accuracy analysis,application scenarios,location-independent equipment,etc.,to carry out the test and analysis.The test results show that the positioning method can be realized without the need to connect WiFi,and the device does not need to install the positioning software,and has the characteristics of cross platform,which can be used for positioning navigation and local area monitoring.