Estimates, Based On The Goal Orientation Of The Vector Hydrophone  Posted on:20050417  Degree:Master  Type:Thesis  Country:China  Candidate:W Wang  Full Text:PDF  GTID:2192360122481724  Subject:Underwater Acoustics  Abstract/Summary:  PDF Full Text Request  A vector hydrophone is composed of two or three spatially colocated but orthogonally oriented velocity hydrophones plus another optional colocated pressure hydrophone.This paper introduces an underwater acoustic eigenstructure ESPRITbased algorithm that yields closedform directionofarrival (DOA) estimates using a single vector hydrophone. This direction finding algorithm may resolve uncorrelated monochromatic sources, but it assumes that all signal frequencies are distinct. It requires no a priori knowledge of the signals' frequencies, suffers no frequencyDOA ambiguity, and pairs automatically the xaxis direction cosines with the yaxis direction cosines. It significantly outperforms an array of spatially displaced pressure hydrophones of comparable arraymanifold size and computational load but may involve more complex hardware. And then, the ESPRIT bearing estimation problem . is reformulated using fourthorder cumulant matrices instead of autocorrelation matrices. By doing so, the fourthorder cumulant matrices of additive colored Gaussian noises can be suppressed. And more aperture extension is achieved in this novel ESPRITbased twodimensional angle estimation scheme using a uniform rectangular array of vector hydrophones spaced much farther apart than a halfwavelength. This proposed scheme and the attendant vectorhydrophone array outperform a uniform halfwavelength spaced pressure hydrophone array with the same aperture and slightly greater number of component hydrophones by an order of magnitude in estimation standard deviation.  Keywords/Search Tags:  direction of arrival estimation(DOA), array signal processing, eigenvector/eigenvalue, sonar signal processing, underwater acoustics arrays, acoustic signal processing, acoustic velocity measurement, blind estimation, phased arrays, vector hydrophone  PDF Full Text Request  Related items 
 
