Research And Implementation Of LED Visible Light Indoor 3D Positioning Algorithm

With the growing popularity of the era of LED lighting,the technology of visible light communication based on LED has been rapidly researched and developed.At the same time,the indoor positioning technology based on visible light also received the attention from many enterprises and scientific research institutions.This positioning technique uses the LED light as the signal light source,and under the condition of the existing universal lighting facilities,adds some simple positioning system equipment,Compatible with lighting,it can provide users with location remote sensing and navigation services and can obtain high positioning accuracy,which opens up new ideas for indoor positioning technology.At present,there are still some problems to be solved in the research of indoor positioning based on visible light: visible light signal interference of multi-led lights,insufficient light source in small space,noise in actual environment and positioning cost.In view of the above problems,this paper proposes an indoor reverse positioning system using single LED lights.This system uses the white LED lights used in daily life as the light source,which is not only consistent with the actual situation,but also convenient for future popularization and application,and reduces the cost.The main work of this paper is as follows:Firstly,this paper studies the current research status at home and abroad based on visible light positioning and the current indoor positioning methods using LED light,respectively introduces and analyzes the main principles and algorithms of these methods,as well as the main ideas of their schemes,and summarizes and analyzes their respective application sites and advantages and disadvantages.Secondly,the channel model of indoor LED visible light is built,the luminous characteristics of LED are introduced,and the luminous rule of single spherical LED light is fitted and analyzed,and based on RSSI receiver to the empirical formula of the distance between the light source.The research shows that the luminous rule of single spherical LED light conforms to the Lambert radiation model,which lays a foundation for the selection of next location algorithm in this paper.Then,the hardware and software used in the receiver designed by the indoor positioning system in this paper are introduced,and the positioning algorithm used in the system is studied and determined.The algorithm is derived based on the principle of three-sided positioning and the relationship between the actual spatial geometry.Finally,the positioning system designed by the text was verified by practical experiments.The results showed that in the indoor environment with a space area of 2m * 2m * 2.5m,the average error of the receiver of the four-detector was 26 cm,and the evaluation error of the receiver of the three-detector was 21 cm.The experimental results were analyzed and summarized.