Design And Implementation Of An Indoor Positioning System Based On Anchor Nodes

With the coming of information era,mobile communication technology and positioning technology have been developing rapidly.The combination of the two above makes individual positioning information more useful.Location Based Services which is regarded as a rising industry has integrated into our daily life.Nowadays,the Outdoor Location technology has almost fully developed and is widely used in Smartphone navigation and car navigation etc.,and it also occupies the majority of the outdoor positioning market.But Satellite navigation system has difficulty in covering indoor environment,while the need for indoor positioning is becoming more and more urgent.Accurate indoor positioning is required in many situations such as the management of huge arena,internet of things and individual positioning service etc.What's more,it can play an important role in emergency rescue,including fire-fighting and evacuation.The theory of indoor location algorithm based on distance is firstly analyzed By improving the Maximum Likelihood positioning,Maximum Likelihood which is based on Dynamic weighting is introduced.It could increase the accuracy of positioning.Next simulation analysis about several positioning techniques is done to prove the superior performance of the algorithm.Then Dead Reckoning algorithm is studied,including heading judgment,step length estimation and step number calculation.Based on the study above,the strengths and weaknesses of Dead Reckoning are analyzed.And then the two algorithms are combined together as a compound positioning algorithm to have an effect on offsetting the weaknesses of each other.The new algorithm is used to realize positioning which can obtain larger positioning range and higher accuracy.Then this paper realizes the positioning system based on AP and Anchor node.This system is composed of two parts.Client is used for Information gathering and server is for data computing.The implementation of information collecting on client-side procedure is based on Android system development The main functions includes collecting positioning information,encapsulating the data into location packets and uploading them to server.Server runs on Linux system,and is mainly responsible for location calculation and data storage.Web system is applied with B/S structure and allows users to checks location information of positioning person and manage the positioning system.At Last,positioning data of the laboratory is collected to analyze system functions and features.The test result proves the feasibility of this system.