Indoor Visible Light Positioning Technology Based On Optical Camera Communication

In recent years,with the popularization of mobile communication networks and smart terminals,more and more attention has been paid to the indoor positioning and location services of smart terminals.The users have set higher and higher requirements for the convenience and accuracy of indoor positioning,the existing indoor positioning technology can no longer meet the current needs.In recent years,the indoor positioning technology based on visible light Light Emitting Diode(LED),has drawn wide attention because of its advantages of high positioning accuracy,wide range of use,natural dense covering,low cost,and pollution-free.Therefore,this thesis made some researches on indoor visible light positioning technology based on camera communication.In this dissertation,UPSOOK in camera communication is deeply studied and verified by experiments.And then,camera communication is combined with image processing technology and machine learning technology.At the same time,we got a in door positioning system based on received signal characteristics(RSF),this system has a substantial increase in indoor positioning accuracy,and through experimental analysis proved the effectiveness and feasibility of the algorithm.The main innovations are as follows:(1)Image multiple-input multiple-output technology(Image MIMO)The proposed image MIMO technology enables the camera to receive multiple LED and other information sent simultaneously.Solve the problem of receiving information in the positioning system.(2)New horizontal positioning algorithm-image positioning algorithmIn view of the characteristics of camera communication,this paper proposes an image location algorithm based on image sensor.The algorithm combines the distance between the sender and the receiver and the position information of the LED obtained by the image sensor to calculate the two-dimensional coordinates of the location point.The algorithm has features of high precision and support for high-speed mobile.(3)LED brightness based ranging algorithm-based on received signal strength ranging algorithmIn the traditional signal strength based on the received signal strength measurement algorithm,the signal strength model is mainly applicable to the wireless signal in the communication,not suitable for the camera image signal communication,this paper combines the characteristics of the camera communication and based on the image signal strength ranging algorithm,and set up a visible light positioning experimental system based on received signal strength ranging.(4)LED brightness difference correction algorithm-based on the received signal feature ranging algorithmBecause the visible light positioning system based on received signal strength ranging has the problems of inaccurate ranging and poor positioning accuracy,a receiver based on received signal feature(RSF)ranging algorithm is proposed,which can more accurately measure the distance between the receiving end and the transmitting end.Improves positioning system accuracy and stability.