Design And Implementation Of Buoy Signal Processing Software For Underwater Acoustic Positioning Monitoring System

With people’s exploration of the ocean,underwater positioning monitoring technology is widely used in both military and civilian fields.Using sonobuoy array to monitor underwater acoustic positioning of underwater targets is an important part of underwater positioning monitoring.In the research background of underwater acoustic positioning monitoring,this paper uses the buoy signal processing software of the underwater acoustic positioning monitoring system to complete the monitoring of underwater targets.According to the requirements of underwater target positioning and monitoring,the buoy signal processing software of the underwater acoustic positioning monitoring system is designed and implemented,including the research and design of the buoy signal processing algorithm,the design and implementation of the communication module,signal processing module,and command control module of the buoy signal processing software.,and the design and implementation of multi-thread calling and communication under BIOS system.This paper firstly studies the signal processing algorithm used by the buoy signal processing software of the underwater acoustic positioning monitoring system.For the positioning monitoring of moving targets,reliable detection of pulse signals in Doppler environment is the basis of subsequent signal processing.Due to the advantages of large Doppler tolerance of FM signals,LFM signal is selected as the target position indication of the underwater acoustic positioning monitoring system.Signal.Aiming at the problem of reliable detection of LFM signal in Doppler environment,the principles of copy correlation algorithm,efficient FRFT fast algorithm and accurate search FRFT fast algorithm are discussed,and the simulation analysis is carried out.The influence of Doppler on the detection performance of different algorithms is studied.the computational complexity of various algorithms.The accuracy of the time delay estimation of the pulse signal is the core of the underwater acoustic positioning monitoring system.In this paper,aiming at the high precision time delay estimation of the LFM signal in the Doppler and low signal-to-noise ratio environment,the copy correlation algorithm and the quadratic correlation algorithm are studied.The application in the field of copy correlation,discusses the influence of Doppler on the time delay estimation accuracy of different algorithms;uses two Doppler influence suppression methods,and analyzes the time delay of copy correlation algorithm and quadratic correlation algorithm before and after Doppler influence suppression.The performance of delay estimation is also discussed,and the influence of signal-to-noise ratio on the Doppler influence suppression algorithm is discussed.Under the BIOS system,through the design of information interaction,instruction execution,signal processing and other modules,the functions of the buoy signal processing software are jointly completed,so that the buoy signal processing DSP software can communicate with the host computer and the target through the ARM,and cooperate to complete the underwater acoustic positioning monitoring system.Real-time detection and delay estimation of target and moving target signals.Laboratory data and lake test data have verified that the DSP software for signal processing of the hydroacoustic positioning monitoring buoy can perform stably and reliably.