Research On The Methods Of Signal Of Transient Noise Analysis

With the continuous development of underwater vibration and noise reduction technology and the study of quiet submarines in various countries,it becomes more and more difficult detecting various steady state radiated noise.Transient Radiated noise has gradually become the largest source of exposure for various quiet ships and submarines.In order to identify enemy targets more accurately and guide elimination of transient radiated noise,transient signal detection and high resolution analysis are studied in this paper.This paper mainly includes four parts,namely,modeling of underwater transient radiation noise,high resolution detection of transient radiation noise,high resolution spectrum analysis of transient radiation noise and extraction of underwater transient radiation noise parameters.Firstly,according to the characteristics of transient signals,the signals is divided into three types: shock signals,pulsating signals and state change signals.According to the characteristics of each signal in time and frequency domain,the transient signal models are established respectively.Secondly,in this paper a transient signal detection method model is proposed based on the extrapolation property of AR model which is a shortened form of auto-regressive model.This method can effectively distinguish multiple transient signals occurring in a short time by detecting the sudden change of the time domain signal,and has a good detection effect on transient signals with lower energy.Thirdly,according to the high-resolution characteristics of AR model,the data at each time are analyzed by windowing and segmenting,and the spectrum is smoothed by combining the characteristics of transient signal with ?-? filtering to obtain the high-resolution spectrum estimation of transient signal.Finally,parameters are proposed to describe the waveform characteristics,parameters and frequency characteristics of transient radiation noise by analyzing the time-domain and time-frequency domain characteristics of transient signals.Based on these four parts of the research content,the transient radiation noise signal processing program and graphical interactive interface are prepared.Through these methods,the pool experiment and Songhua Lake experimental data were analyzed and discussed,and the corresponding analysis results and conclusions were obtained.