Research And Design Of Underwater Text And Voice Short Message Acoustic Communication System

With the increasing frequency of human production and life in the ocean,how to achieve reliable and convenient communication during underwater operations and diving recreation has become the focus of research.At present,many underwater communication devices at home and abroad only have voice intercom function,and the communication will be interfered by many kinds of noise,when the frogman receives safety instructions sent by other devices,the voice call alone is prone to error,which restricts the development of deep-sea exploration technology in China and cannot meet the needs of many situations.Traditional underwater communication equipment lacks the function of monitoring human safety,which brings potential safety risks to frogmen when they are engaged in various operational activities underwater.In this thesis,we propose an underwater text and voice short message acoustic communication system,which adopts a hybrid communication frame structure and combines the features of Multiple Frequency Shift Keying(MFSK)digital communication with anti-jamming and anti-multipath fading capabilities,and adds a human safety monitoring module to improve communication reliability,thus ensuring the underwater The system is also designed to ensure the safety of underwater operators.The communication system is of great significance to the realization of information transmission in the hydroacoustic channel,and also provides new ideas and ways to further develop new wireless communication technology based on hydroacoustic channel.The research areas covered in this thesis include but are not limited to the following directions.1 、 Theoretical aspects: In terms of analog modulation,three ways of single-sideband modulation are analyzed and the Weaver method is chosen as the solution;in order to improve the reliability of MFSK communication,various error correction mechanisms are introduced in digital modulation to ensure the stability and reliability of communication.2.Hardware: Estimate the parameters required for this system.The appropriate signal processing platform and voice codec chip are selected in the system hardware scheme,and the scheme of system power supply circuit,sensor monitoring circuit,communication circuit and automatic gain circuit are designed.3、Software: In order to ensure effective data transmission and processing,a complete frame structure is designed,the transmission mode of data is discussed,the C language program of single-sideband waver method for analog communication and MFSK algorithm for digital communication is written,and the implementation method and process of corresponding modules are completed.4、System test and test: Test each voltage of the device,automatic gain circuit and output of power amplifier.Test the performance of the system by pool test and field test,and finally propose the next step of the thesis.