Research On Key Technologies Of Ultraviolet Communication Signal Processing Based On Photoelectric Joint Compensation

Ultraviolet communication system in mobile scenarios will cause the fluctuation of the received light energy with the change of the receiver position,resulting in the shortage of power utilization.In order to enhance the perception of the environment in the mobile communication system,this paper explores the way of photoelectric combination,using the optical performance adjustment of optical antenna to enhance the communication quality of the system.Firstly,a low power ultraviolet communication system is built.The transmitter uses ultraviolet LED as light source,the receiver uses photomultiplier tube as detector,and the effective bandwidth of the communication system has a speed of 600 Kbps.In the circuit design of the system,a high-speed level conversion circuit based on OPA820 is designed to convert high-speed bipolar high-level analog signal into unipolar low-level analog signal.A signal circuit based on STM32F767 microprocessor is designed.The circuit is equipped with Ethernet chip W5300 to realize network transmission with 100Mbps bandwidth.The system transmitter uses SPI-based high-speed signal transmitting module to send high-speed signal.Receiver uses ADC as signal sampling module,and ultimately uses Ethernet to forward the received data to the host computer.After the communication system is built,an adaptive zoom receiving system is designed to solve the noise interference problem of the ultraviolet communication system in the mobile scene.Firstly,the cam zoom mechanism is selected and the antenna optical-mechanical structure is designed by using Creo mapping software.Then,a stepper motor driving module with controllable network is built to form a UV zoom receiving system with variable field-of-view angle.Finally,adaptive feedback control is applied to the receiving system,so that when the space position of the receiving system changes,the signal-to-noise ratio can be effectively improved and the power utilization ratio of the receiving can be enhanced by adaptively adjusting the field of view angle of the receiving lens.Finally,it lays a foundation for realizing highly reliable short-range space-varying and time-varying mobile ultraviolet communication.