Design And Implementation Of WIFI Indoor Positioning System Based On Location Fingerprint

Ten years ago,the popularization of the Global Positioning System brought great convenience to people's lives,where people walked in a strange city and used real-time positioning of their portable phones for navigation and destination navigation.However,when people enter the shopping malls,hospitals,libraries and other internal structure of the complex interior,they found the hands of the mobile phone positioning of their own location there is a great error.People have an increasing demand for accurate positioning technology,so in the market,there have been a large number of indoor positioning technology in the complex indoor environment,such as Assisted GPS positioning technology,Radio frequency positioning technology,Ultra-Wide Band positioning technology,Ultrasonic positioning technology,Bluetooth positioning technology and so on.These positioning techniques or because the positioning accuracy can not meet the needs of the reasons or because of their high cost of can not be widely used in the market.However,the indoor positioning technology based on WiFi has attracted much attention because of it is low cost,easy to install,requires very little base station,practical and positioning accuracy can reach meters.The work of this paper is divided into the following aspects:First of all,it analyzes the reason of determining the subject,that is,the background of the development of indoor positioning technology and its development status.Secondly,this paper analyzes and studies several typical indoor positioning technologies and compares them,establishes that the Wi Fi positioning technology based on location fingerprint will be used to the positioning system.Then the article introduces the WiFi positioning technology in detail,such as its offline,online two steps,the positioning algorithm used in the online phase and so on.And then propose an algorithmic improvement program,it introduces signal propagation model,finds and narrows the K-gon.The core algorithm of the positioning system is determined.Finally,after defining the positioning technology of the indoor positioning system and the localization algorithm of the positioning technology,the paper designs and implements a Wi Fi indoor positioning system based on position fingerprint.Based on the above work,the design and implementation of the indoor positioning system is completed,the article on the positioning syste m positioning results were compared to verify the positioning system of the effectiveness and feasibility...