Research On Indoor High Precision 3D Positioning Based On Visible Light Communication

Location services is an important driving force for the development of unmanned driving and logistics management,users have higher requirements for real-time accurate positioning service now.Indoor positioning based on visible light communication(VLC)is a technology that uses LEDs as signal source to transmit ID information in an optical channel,and the receiving terminal demodulates the received optical signal to achieve positioning.This paper focus on two common receiving terminals—— photoelectric sensor(PD)and image sensor(IS),and aims at how to realize fast and high precision three-dimensional positioning technology,how to provide the position and orientation information of the receiving terminal under real scene.This paper carries out in-depth research and builds an experimental platform to verify the designed algorithm.The main research contents are as follows:1.This paper designs a fast and high precision three-dimensional positioning algorithm based on adaptive differential evolution(DE)algorithm,uses the received signal strength(RSS)and PD receiving terminal.Firstly,the visible light location problem is transformed into the global optimization problem,and the adaptive differential evolution algorithm is used to search the receiver height optimal value in the location space.Then,according to the geometric relationship of the projection circle of the LED light source on the receiving terminal plane,the X and Y axis coordinates can be obtained by bringing the height of the receiving end into the formula.The simulation results show that the algorithm can ensure the accuracy of 3D positioning at centimeter level and improve the speed of single point positioning greatly2.This paper designs a VLC static 3D positioning algorithm based on improved Perspective-n-Points(Pn P)and monocular cameral.Firstly,the number of bright stripes in the image is used as a feature,and a fast LED ID demodulation algorithm is designed.Secondly,the projection of each LED lamp on the image sensor is regarded as a single feature point,and obtaining several pairs of two-dimensional image coordinates and corresponding threedimensional world coordinates of the LED lamps.An improved Pn P algorithm is proposed to make full use of the features of visual ranging in VLC system,and finally the position and orientation of the receiver are calculated.The visible light positioning platform was built and the effectiveness of the algorithm was verified by experiments.3.This paper designs a VLC dynamic 3D positioning algorithm based on multi-object image tracking method.The first frame image detects the LED-ROI and initializes the target template,and the subsequent image frame realizes multi-target tracking through the optimized template matching method,thereby obtaining the pixel coordinates of the center of the LED circle in each frame image.After implementing the LED-ID identification process,combined with the matching 3D-2D feature points of the LED and the improved Pn P algorithm,the dynamic three-dimensional positioning is finally achieved.Experimental results show that the algorithm has good real-time performance.