Research Of Indoor Location Technology Based On Multi-sensor Intelligent Terminal

Relying on indoor GIS(Geographic Information System),indoor location technology and the internet applications.The location based service has become the focus of people's attention.The indoor location service can not only bring convenience in life for people,but also the venue management needs urgently.The well-known enterprises and some famous universities are studying the indoor positioning technology.This paper focuses on the indoor location technology based on multi-sensor intelligent terminal.By analyzing the difficulties in the system design process,the paper studied in anti-interference location algorithm based on Wavelet transform and data-fusion technology of multi-source based on B-P Neural Network.The paper analysis the current status of the location technology,introduces the WLAN technology,and discuss the technical defects and room for improvement.The paper proposes two methods to improve the location accuracy.One is filtering the signal with the noisy,the other is improving the algorithm during the matching process.Firstly,by using the Wavelet,the paper analyses the collection signal,and eliminates the noise by multi-resolution transform.The algorithm can restore the original signal as much as possible,and avoid dynamic noise by indoor NLOS,multipath phenomena and the Human interference.Secondly,the different types of signal are collected by multi-sensor intelligent terminal.The limited fingerprint points are training by B-P Neural Network,and the weight are assigned to every source.During the on-line matching stage,the coordin'ates are calculated by the KNN and PDR algorithm.The algorithm uses the weight from the training results of the B-P Network to locate accurately with the calibration points.The accumulated error can be reduced and the location accuracy improve significantly by contrasting the fingerprint points with no training process.Finally,the indoor location system multi-sensor intelligent terminal is designed and developed.The system is used in the actual project of the laboratory.The algorithms in this paper are verified by the system.The experimental results show that the research based on the indoor location technology based on multi-sensor intelligent terminal improves the system stability extended system compatibility and reduce the location error of WLAN location system.