Research On The Second Phase Amplification Localization System Inspired By Ormia

The sound source localization system is a positioning system for positioning the target utilizes sound waves emitted by the target,depending on the using function generally divided into the angle type,the distance type and the all-purpose type,widely used in the field of civil and military areas.Sound source localization system is usually divided into the acoustic sensor and the signal processing section.After receiving the acoustic sensor signal,the signal localization system will transfer the signal to the signal processing section.Wherein the angle type positioning system is a system which use of the amplitude difference of signals receiving by different sound sensor.So,the system will have maximum sensitivity when the distance of sound sensor and wavelength of the target is similar.Thus,obtaining a highly accurate angular positioning information is an important issue in the case of a small distance of the acoustic sensor.The subject " Research on the Second Phase Amplification Localization System Inspired by Ormia" study a localization algorithem belong to the angle type which can promote the positional accucy by amplify the phase difference twice.The main contents of the paper include:First,based on the principle of acoustic analysis angle positioning system and a positioning system signal processing algorithm to determine the method of calculating the phase angle of the positioning target.Further,the analysis of several classical phase positioning method further laid a theoretical foundation for future study in the positioning based on the principle of phase method.Secondly,based on the analysis phase positioning method,the localization algorithem inspired by Ormia was studied.The algorithem can amplify the phase difference of different signals by way of using bionics filter,without changing the size of the acoustic sensor array.Thirdly,on the basis of the biocins filter,the paper proposed the Acoustics Phase Diamplification Algorithem(APDA),which can amplify the phase difference twice based the first amplify of phase difference.Under conditions such that the same sensor array distance the APLA has been further enlarged the phase difference compared the bionics filter,which may further improve the positioning accuracy of the system.Meanwhile,since the APDA have higher requirments of amplitude-frequency characteristic and phase-frequency characteristic of bionics filter,further bionics parameters were studied,so that APDA can apply different working frequency.Finally,the paper has executed the actual analysis and experimental verification of signal to noise ratio for secondary amplification algorithms.Experiments show that in most cases the secondary amplification positioning system has great sensitivity and accuracy than tranditional positioning system.