Rapid acquisition method of sea vessel radiating transient noise effective time based on the power-law

摘要

Ship transient noise generally has the characteristics of strong energy, short duration, and frequent appearance and so on, for sonar, these features not only affect their own working performance, but also are easily detected by enemy sonar, so, grasping the features and magnitude of underwater radiation noise will be conducive to the management work of guiding ship radiating transient noise. In order to effectively evaluate the acoustic features and magnitude of ship transient noise, accurately acquiring the beginning and end time is needed, some traditional transient signal detection methods can realize the extract of central moment, but the accuracy of extracting persistent time is poor, based on this reason, the paper uses power-law algorithm for transient signal waveform of the structure of the "sensitivity", combines with line-spectrum extraction technology and wavelet transform, gives full play to the advantages of the algorithm itself, to realizes rapid intercept of effective analysis time of ship transient noise, thus laying the foundation for characteristic analysis and level assessment of transient noise. The theoretical simulation result shows that this method can effectively eliminate the interference of steady state and background noise, and ensures the extraction of effective analysis time to transient noise. By conducting sea sound simulation experiment, using this method to analysis underwater radiation noise data, and the analysis result shows that this method can quickly and efficiently extract the beginning and end time of transient state noise, obtains the acoustic features and magnitude, and has a better engineering application value.