Research And Design Of Underwater Acoustic Communication System For Miniature Unmanned Underwater Vehicle

With the continuous development and utilization of Marine resources,unmanned submersible Unmanned underwater vehicle(UUV)is widely used for its small size,low cost and strong autonomy,which can perform tasks in dangerous or unknown waters.Because the information interaction between the UAV and the mother ship in the water depends on the acoustic wave propagation,it is susceptible to the complex Marine environment,which also puts forward higher requirements for the performance of the underwater acoustic communication system of the UAV.In this paper,we conducted research and design on the microscale UUV acoustic communication system,builds the data transmission terminal and data acquisition terminal of the underwater acoustic communication system,and constructs the underwater acoustic communication architecture.On this basis,it studies the related problems of the underwater acoustic communication system according to the complex Marine environment,studies the hardware implementation scheme,and tests the constructed system.The specific contents are shown as follows:(1)To solve the difficult problems of detecting communication signals in complex underwater environment,this paper combines the empirical mode decomposition(EMD)algorithm with the PCA technology,adopts the fully orthogonal empirical mode decomposition algorithm(PEMD)based on the traditional EMD algorithm can extract the target signal more effectively,reduce hardware system power consumption,and improve signal transmission efficiency.(2)For the transmission information will be affected by water channel noise and signal attenuation,cause transmission information distortion and receiving terminal judgment error,this paper using the three decoding algorithm based on RA code for simulation analysis and experimental verification,the results show that the preferred MS decoding algorithm than BP decoding algorithm and LLR-BP decoding performance while reduce the hardware system computation,more likely to meet the requirements of underwater communication.(3)Based on the analysis of the system requirements,the hardware modules were optimized and the overall construction of the hardware system was completed.In order to accurately identify data information,this paper designed a communication protocol between the sending and receiving signals to enhance data transmission stability and reduce data loss during communication,providing a more efficient and reliable data transmission method for the acoustic communication system.Finally,through experimental simulation verification of the built acoustic communication system,the results show that the designed acoustic communication system has characteristics such as high speed,low power consumption,low cost,and real-time performance,which meets the design requirements of micro UUVs,and can achieve reliable,safe,and efficient acoustic communication purposes.