Design Of Sonar Transceiver System Based On Chaotic Modulation

With the development of offshore detection technology,the realization of high precision,low power consumption and high concealment of military shallow sea sonar has become the main direction of current offshore detection research.The current mainstream method of shallow sea detection is still traditional beam sonar scanning.However,due to the shallow sea Complex noise environment and severe multipath interference,scanning accuracy and transmit power have become the main contradictions restricting the development of shallow sea beam sonar.Based on this contradiction,this paper proposes to use chaotic sequences with noise-like characteristics and high autocorrelation characteristics as transmitted signals.Improvement plan for shallow sea beam sonar.This paper comprehensively compares three typical chaotic sequence generation methods,proposes to cascade Logistic chaotic maps and Chebyshev chaotic maps to generate composite random sequences with stronger chaotic characteristics,and analyzes the noise interference methods of underwater acoustic channels,and proposes the use of Lyapunov adaptive demodulation The device compensates the parameters of the cascaded chaotic sequence to compensate for the underwater acoustic channel filtering loss;combined with the autocorrelation characteristics of the cascaded chaotic sequence,the additive noise is eliminated and the return distance is settled by the coherent time delay method.On this basis,this paper combines the beam sonar equation and the realistic background to propose the index of this simulation system.According to this index,a chaotic sonar simulation system including receiver,transmitter and host computer is designed.The system controls each part through FPGA Collect and convert stored signals,upload to PC for data settlement and integrated drawing.Through the overall performance test of the system and repeatability experiments,it is verified that the measurement error rate of the chaotic beam sonar system is less than 15%,reaching the system design index,and the scanning cross section of the detected target can be obtained by sampling with small step angles and removing boundary data After testing,the system effectively improves the detection accuracy,reduces the transmission power,has good anti-noise performance,and effectively improves the problems faced by traditional shallow sea beam sonar.