Three-dimensional Indoor Visible Light Positioning System Based On A Tilted Receiver

Recently,the visible light communication which is a new wireless communication technology compared with other wireless communication technology has energy saving,no electromagnetic interference and high transmission rate characteristics.LED as a light source of the visible light communication system can illuminate and carry out data transmission at the same time in order to achieve the integration of lighting communications.Nowadays,the global positioning system has matured,he has been able to achieve high positioning in the outdoor positioning accuracy,but in a complex indoor environment can not use the global positioning system for indoor positioning.Therefore,the visible light positioning has gradually become the research focus of indoor environment.This paper based on a single transmitter and a single tilted optical receiver,a three-dimensional(3-D)indoor visible light positioning system is proposed.The tilted optical receiver is installed on a rotatable and retractable platform.The 3-D space is divided many two-dimensional(2-D)planes by lifting the platform of the optical receiver.In each 2-D plane,various azimuth angles can be obtained by rotating the receiver platform,which offers a feasible way to perform multiple measurements with different azimuth angles to achieve the angle gain.According to the difference of the angle gain,a 3-D positioning algorithm is proposed.Experimental results show that the proposed positioning algorithm can provide good positioning accuracy.Based on the three-dimensional positioning system,the research focus of the paper mainly includes the following aspects:(1)Based on the study of the common indoor visible light positioning technology,based on the background knowledge of the visible light communication system,this paper proposes a 3D visible light positioning system based on single tilt receiver.In the system,the designed light receiving module is combined with an optical bevel and a rotating platform and a lift bracket to form a tiltable rotatable receiver.It provides an effective guarantee for the precise azimuth angle measurement in the positioning system,which reduces the error caused by the angle measurement.(2)In this paper,a three-dimensional visible indoor positioning demonstration system based on single tilt receiver is constructed.In this demonstration system,the positioning experiment in three-dimensional space is carried out by lifting the receiver bracket.The average positioning error between the actual position and the estimated position in the experimental environment of 600 mm * 600 mm * 1135 mm is less than 35 mm.The experimental results show that the three-dimensional visible indoor positioning system based on single tilt receiver has high positioning accuracy and provides a new solution for visible indoor positioning.(3)In order to improve the system performance and positioning accuracy,the influence of the receiver tilt angle on the system performance is studied.Based on the output expression of the channel capacity,an optimization problem is proposed to improve the performance of the system by tilting the receiver plane.The optimization problem is solved by a special solution tool.Finally,the simulation of the tilt angle? and other variables is obtained: when the optical power of the system is constant and the half power angle of the LED light source is appropriate,the inclination angle of the receiver can be increased,and the visible light room based on the single tilt receiver can be improved Positioning the system performance of the system,so as to further improve the accuracy of system positioning.