Research On Near-field Noise Sources Location Method Based On The Combinatory Array

The lever of underwater targets' radiation noise has an important effect on the range of passive sonar.In recent years,more and more countries are committed to the research on reducing radiation noise level.with the increasing of technology,the stealth performance of underwater targets is improving constantly,it becomes more and more difficult to find the underwater targets' possion for passive sonar.In order to realize the identification and localization of low radiated noise targets,it is necessary to improve the near-field localization performance,and have an research on the near-field noise source localization method.In the study of localization in shallow sea noise source,the reflections of tnterface has produced important effects on the noise source localization,for the multipath environment.This problem makes it difficult to realize the accurate location of sound source used near field focuslocalization algorithm.Aimed at soloving this problem,this paper adopts time reversal mirro rtechnology to locate the position of sound source in shallow sea,with analoging the channel information of multipath environment and matchitng the time reversal of channel information with receiving signal.Beause of the port and starboard ambiguity of the rboard ambiguity,this paper adopts the combination of vector with the pressure array to remove the false source.In this paper,in order to test and locate the warship machinery noise under the docktesting condition,carried out the research on the method of near-field passive time reversal focusing location based on combination array.Based on the virtual source model of ray theory,this paper introduces the locilization principle of passive time reversal.Making a research on near field localization method of acoustic pressure array,to verify the passive time reversal technique can be used to locate the possion of noise source in shallow water,because it can be effectively utilized the multipath information.On this basis,combined the passive time reversal technique with array combination,to carry out the passive time reversal focusing location method based on the plane and cylindrical sound radiation surface.The signal frequency,the possion of sound source,the array aperture,the number of array elements,test distance are discussed on the noise source localization performance.Finally,the experimental study of combined array PTRM location method is carried out in the reverberation pool.The analysis of experiment results verify the effectiveness of thealgorithm in the multipath environment,providing the basis for the realization of noise source near-field location.