Design Of Underwater Positioning And Communication Integrated System Based On Photoelectric Array

As many countries increase their efforts to develop marine resources,people are eager to find out a more efficient and stable underwater positioning technology.Current technologies commonly used in underwater positioning include acoustic wave positioning technology and visual positioning technology.The visual positioning can be easily affected by the complex underwater environment and it increases the volume and power consumption of the AUV,which severely limits its application in seawater.At present,the development of underwater acoustic positioning technology is relatively mature,but it can only meet the rough positioning at a long distance,and the positioning accuracy at a close distance still cannot meet the demand,and also it has shortcomings like the large transmission delay of acoustic wave in water,with which information can be easily eavesdropped,high energy consumption complexity equipment and so on.Compared with acoustic positioning and visual positioning,underwater LED light positioning technology has the advantages of high positioning accuracy,strong stability,prevention of information interception,miniaturization of equipment,and low energy consumption.It will definitely stand out in the future scramble for marine strategic resources.In order to meet the requirements of underwater positioning accuracy,this design has developed and implemented a set of integrated underwater positioning communication systems based on curved photoelectric detection arrays,realized accurate adjustment of attitude,and communication after positioning.The main contents of the work are as follows:(1)Summarize the factors that affect the transmission of light in seawater,and on this basis,we have obtained an optical power receiver model that can be used in different sea areas,which provides a theoretical basis for meeting the needs of positioning and communication simulation.(2)Introduces the current commonly used underwater positioning technology and the advantages and disadvantages of each technology.After a comparative analysis,the most suitable underwater positioning scheme is selected.A distribution that can achieve the best positioning accuracy based on the surface array is proposed.The spacing scheme is explained by simulation analysis.(3)Introduces the modulation technology mainly used in underwater optical communication.After various comparisons,it is determined that multi-level pulse position modulation(Multilevel-Pulse Position Modulation,M-PPM)is the most suitable modulation method for underwater optical positioning communication system.(4)In order to meet the premise of underwater optical positioning,the production of curved photoelectric detection array was completed by using a flexible circuit board.(5)Design the hardware circuit,and make and complete the writing of the software program,and finally realize the integrated system of underwater optical positioning communication based on FPGA.The accuracy and stability of the system positioning are tested.The positioning test results show that the system can accurately estimate and adjust attitude at any deflection(pitch,yaw)angle.After the positioning is completed,the communication bit error rate is tested.The test results show that the system can communicate stably and the bit error rate is lower than 10-6.