Design And Implementation Of Visible Light Indoor Positioning System Based On Camera

With the improvement of the smart home ecology,the arrival of the Internet of Everything era brought about by 5G communication technology,and the maturity and further development of autonomous driving technology,in order to cope with the navigation and location services in the above scenarios,the research on positioning technology is very important.Visible Light Positioning(VLP)technology is based on Visible Light Communications(VLC)technology and a new type of wireless indoor with low energy consumption and no radio frequency interference based on Light-emitting diode(LED).Positioning Technology.The visible light indoor positioning technology can realize high-precision and low-cost indoor positioning service by using the existing LED lighting system,which has theoretical research and practical application value.This topic comes from the National Natural Science Foundation of China Youth Fund Project(Project No.:61901047).The receivers of the existing visible light indoor positioning system are mostly dedicated hardware devices such as photodiodes(PD)and dedicated image sensor devices to receive signals,which increases the cost and implementation complexity of the visible light positioning system,and limits the system portability.In view of the above problems and challenges,the design and implementation of a visible light indoor positioning system based on mobile phone cameras are studied in this subject,which will provide effective experimental verification for subsequent theoretical research.The research contents and innovations of this thesis are summarized as follows:1.Design of visible light indoor positioning system based on camera.In view of the problems of the current system implementation cost,high implementation complexity and poor portability of the visible light indoor positioning system based on PD and dedicated image sensors,it is not easy to large-scale commercial promotion.This thesis focuses on the characteristics of versatility,compatibility with multiple platforms and low cost from the hardware equipment and circuit selection of the sending end and the receiving end of the system,and completes the design of the system.The specific work of the design of the sending end of the system mainly includes the selection of x86 type PC,the multi-platform compatible modulation module microcontroller Arduino,the design of low-cost LED driver circuits,and the selection of LEDs that broadcast VLC information;the system’s receiving end equipment selection Honor V20 mobile phone,and put forward design requirements for the hardware parameters of the receiver mobile phone camera according to the needs of the system.The design of the visible light indoor positioning system based on the mobile phone camera effectively reduces the design cost and design complexity of the system,and at the same time greatly improves the portability of the system,providing support for future large-scale commercial use.2.Realization of visible light indoor positioning system based on camera.Due to the instability of the video frame rate when the mobile phone camera at the receiving end records video,the transceiver ends of the system are out of synchronization,which directly leads to errors in the recovery process of the positioning signal,which in turn affects the positioning performance of the system.In order to solve this problem,in the implementation process of the visible light indoor positioning system based on mobile phone camera,this thesis proposes that the transmitter design the unique code(Unique Identification,UID)of the transmitter according to the modulation principle of Undersample Phase Shift OOK(UPSOOK)coding scheme and then complete the realization of the system sending end.For the implementation of the receiver,an adaptive threshold threshold scheme,a forward error correction algorithm for frame rate jitter and a decoding scheme for multi-LED positioning signals are proposed to effectively ensure the accuracy and reliability of VLC in the VLP process.The main work of this thesis is to complete the software implementation of the transmitter and receiver of the system.Finally,the communication performance and positioning performance of the system are measured.The experimental results show that the communication bit error rate of the system is at a level sufficient to meet the visible light indoor positioning scenarios.The positioning accuracy of the system is 10cm.