Development Of Visible Light Location Platform Combining Visual And Light Intensity And Research On Location Algorithm

Indoor positioning is of great significance to improve the sense of science and technology in people’s life,improve the work efficiency of industrial production environment,and construct indoor and outdoor integrated positioning and navigation system.Visible light positioning transmits positioning information by controlling rapid light intensity changes of the light emitting diodes(LED)used for indoor lighting.Photo diodes(PD)and image sensors are used to receive positioning information,and the position is calculated by positioning algorithm.With the continuous popularity of LED lighting and the continuous development of intelligent terminal equipment.Visible light positioning has the advantages of low cost,high precision and easy popularization,which is a promising indoor positioning technology.The research work of this thesis is supported by the National Natural Science Foundation of China(61901047).At present,there are a lot of localization algorithms and simulation experiments in visible light positioning,but there are not enough verification platforms to support it.Most of the existing verification platforms only use either light intensity information or image information for positioning,which limits the portability and positioning accuracy of the positioning system.In order to solve the above problems,a visible light location platform combining visual and light intensity information is developed.It is found that LEDs tilt angle and number of LEDs has certain influence on positioning accuracy during platform measurement.Therefore,perspective-three-point(P3P)visible light positioning algorithm assisted by photo diode is proposed to effectively reduce the positioning error caused by LEDs tilting.The main research contents of this thesis are as follows:1.A visible light location platform combining visual and light intensity information is designed and implemented.The hardware selection and software design of platform sender and platform receiver are completed.The sender encapsulates,codes,modulates and broadcasts positioning data.The receiver is responsible for the acquisition and processing of image and light intensity information.In addition,it is also responsible for the calculation and display of positioning results.It can be used to test the performance of various positioning algorithms.And through the test results found that LED tilt angle has a certain impact on the positioning algorithm.2.The PD-assisted P3P localization algorithm is designed and implemented.In addition,the effectiveness of the algorithm is verified by platform test.In order to solve the problem that LEDs tilt angle has influence on positioning algorithm in platform measurement,the PDassisted P3P algorithm is proposed.Firstly,visual information is collected by image sensor,and the distance solution set between receiver and sender is obtained by P3P algorithm.Secondly,the optimal solution of the distance solution set is obtained by the light intensity information collected by PD.Finally,the positioning results are calculated.Experimental results show that the proposed algorithm can achieve centimeter-level indoor positioning with three LEDs.