Research And System Design Of Shallow Sea Sound Source Location Method

The radiated sound source generated by the large underwater vehicle of submarine is the key factor that affecting self stealth performance.Since the relevant detection mainly relies on acoustic means in recent years,and the analysis of radiated sound source can effectively guide the implementation of vibration and noise reduction.Therefore,the research on the location method of near field radiated sound source among large underwater vehicle has obvious application value.It is of great significance to study the near field sound source location method especially most of China's territorial sea belongs to the shallow sea.According to the study of conventional near field sound source localization,this thesis first expounds the basic principle and method,sets up the near field receiving array model,compares the effects of different parameters on the performance of the near field sound source positioning methods along with the advantages and disadvantages of different positioning methods,then analyzes the effective positioning conditions of different positioning methods and their effects on the minimum resolution of positioning.Secondly,based on the sound source localization of large underwater vehicle in shallow sea,it studies the near field sound source localization method under the influence of multiple path effect and the problem of multiple strong interference sources.Besides,it establishes a typical mathematical model,solves the influence of multi-path effect with passive time-reversal technique and focuses beamforming method,then discusses the effective positioning conditions of passive time-reversal positioning method and its influence on the minimum resolution of positioning.Moreover,it uses spatial filtering technology and focuses on combining beamforming method to figure out the weak target in multiple strong neritic interference of sound source localization problems,designes the rule of minimum mean square and the second-order cone programming matrix under the regulation of two kinds of spatial filter,then studies the localization accuracy of weak target in the presence of multiple strong interference sources with spatial filtering method.Based on the actual radiation surface of sound source,it explores the method of near field localization on cylindrical sound source.The focused beam method can resolve the problem of near field localization of cylindrical distributed sound source.The vector hydrophone and sound pressure hydrophone are used to establish the combined array near field receiving model,so as to settle the problem of "starboard ambiguity" with the unilateral directivity of vector hydrophone.Furthermore,it simulates the above theoretical method and verifies the feasibility with small error and high positioning accuracy.Finally,according to the actual testing needs,it designs a shallow sea sound source positioning system,which has two functions: simulation analysis and testing along with measured data analysis,while the research algorithm can be embedded with strong practicability under intuitive and simple operation interface.