A Research On Wireless Network Location System Based On Location Fingerprint

In recent years,with the rapid application of mobile intelligent terminals,the rapid spread of wireless networks,based on the needs of location services applications show a rapid growth trend.At present,based on the location has been rapid development and universal to life and production in various fields,and gradually show a good technology development prospects and a huge market space.Due to the huge demand for location information,location technology has been closely linked with location-based services.Accurate and timely positioning technology is based on the premise and key of location service implementation.Most of the existing indoor positioning technology,most of the technical means require additional proprietary hardware devices,so that the positioning accuracy and positioning area will be covered by proprietary hardware devices and the positioning of high cost is not conducive to location-based Service in the indoor application and promotion.Based on the WiFi and receive signal strength of the indoor positioning method is to take full advantage of the existing wireless LAN infrastructure,and does not require additional proprietary hardware devices,only a certain amount of software support,you can achieve mobile intelligent terminal positioning.And because the current WiFi hotspots in the indoor deployment of a wide range of intensive,making WiFi-based indoor positioning of the technical means to become now one of the main positioning.Based on the WiFi network location method because of its low positioning costs,low hardware requirements,to meet the majority of indoor positioning applications for the accuracy requirements of the characteristics of positioning technology has become the first choice.However,due to the widespread deployment of indoor access points and the increasing number of mobile intelligent terminals,the indoor radio propagation environment has become more and more complicated,the received signal strength of the radio signal is more variable and complicated,seriously affecting the location based fingerprint The positioning accuracy of the indoor positioning system,the location fingerprint based WiFi positioning technology brings new research content,but also to the scholars put forward the more difficult challenges.Based on the actual application of location-based services,this paper investigates and studies the relevant background of location-based WiFi localization technology and the current research situation at home and abroad,and discusses the key issues such as how to improve the accuracy and efficiency of indoor positioning.In order to solve the problem of fingerprint location localization algorithm,this paper introduces several main location fingerprint localization algorithms,and then explains the shortcomings of K nearest neighbor method.In order to overcome the shortcomings of K Nearest Neighbor Law,an improved algorithm is proposed.This algorithm adopts the idea of spatial division,divides the range of the target to be classified into several regions,and then performs weighted processing when ranging Method to improve the shortcomings of K nearest neighbor law.Experiments show that the improved regional partitioning algorithm has a certain degree of improvement compared with the traditional K nearest neighbor method,the average positioning error is 1.58 meters,and the probability of localization error is within 75%,which proves the feasibility of the improved algorithm.