Information Processing And Controlling System For Underwater Optical Video Communications

With the continuous research of marine resource exploration,the number of intelligent sensors underwater is increasing.Therefore,the underwater wireless communications,an important supporting technology is in demand for high-capacity data transmission,and has become a research hotspot due to its low link delay,high transmission rate,etc.Based on the aforementioned demands,an information processing and controlling system is designed for video transmission in underwater optical communications.The primary work is as follows:(1)The host computer software is implemented via C# to realize the collaborative work of the system,and is used to process and control information.It has such functions as hardware switching,communication rate control,video compression,calculating the bit error rate(BER)and displaying it,Ethernet communication,etc.(2)The modules of the slave computer(field-programmable gate array,FPGA)are implemented in Verilog HDL,having the functions of Ethernet communication,mode control,RS codec,8B/10 B codec,BER test,etc.The system has two working modes: BER test mode2 and communication mode 1.The effectiveness of data processing of each module is validated by Signal Tap ? and Wire Shark.(3)An underwater video acquisition subsystem is designed for the study of underwater detection as mode 3.It consists of the video capture and data storage module based on FPGA and its peripherals containing the OV5640 camera and DDR2 memory,and the effectiveness of splicing of the data stream is verified.The real-time video display interface is programmed in the C# based on the host computer.(4)The two ends of the communication are connected by coaxial transmission line to simulate an optical channel capable of stable communication for system function and performance testing.Experiments of mode 3 are conducted based on the underwater environment simulated by the small water tank.Finally,the system is connected to the optical emission and receiver module for the integrated underwater communication experiments.The experiments show that the system is functionally realized with good stability and practicality.The key parameters of communication rate,distance,and BER in underwater optical communication can be obtained.Underwater optical communication demonstration system with PC and camera as the source was realized respectively.