Study On Multistatic Sonar Detection Waveform Design And Signal Processing

The large multistatic sonar system is one of the trends in today’s sonar systems,sonar signal waveform design technology is one of the most important aspects of sonar system design.Sonar signal waveform not only determines the receiver’s signal processing method,but also affects the detection performance of the target.In this thesis,we study the design of signal waveforms for three applications in multistatic sonar cooperative detection of big Doppler tolerance,high target tracking rate and multi-source network cooperative detection.Firstly,the paper studies the design of signal waveform parameters based on the overall detection performance of multistatic sonar.The signal time bandwidth product and signal processing gain is analyzed,and the relationship between the estimation accuracy and signal parameters of direction relation is discussed.Besides,the paper analysis of the multi-source distributed detection and tracking of the necessity and the research idea of waveform design of moving targets.Secondly,in the Doppler tolerance sonar signal waveform design,the ambiguity function of detection signal is studied,considering the signal Doppler tolerance,Doppler invariance,auto correlation function properties.The pulse of HFM sequences with M sequences is the available signal,using matched filtering signal processing method.Again,in the high refresh rate of target tracking signal waveform design,the tracking performance of the CAS signal and the PAS signal is comprehensive compared.In the case of the same detection performance the CAS signal can reduce the sound source level.The CAS signal could be the detection signal of this application,using sub-band signal processing and matched filtering signal processing method.Besides,the relationship between the processing gain and the refresh rate is discussed.Finally,in the multi-source distributed collaborative detection signal waveform design,considering signal waveform orthogonality,bandwidth efficiency,signal processing gain and the transmitting station number.The detection performance of the OFDM signal and Gold sequence is analyzed.The Gold sequence has the advantage of high reliability,and it can include a large number of users operating simultaneously and can be applied to the environment with big Doppler.