High Resolution Methods in Active Sonar Array Signal Processing

摘要

In this report, the problem of high resolution array signal processing in an211u001eunderwater scenario is discussed. With such method high resolution in bearing can 211u001eobtained even for an array with a restricted length and they are therefore of 211u001egreat value for torpedo target seekers. The methods may by a beam space transform 211u001ealso be applicable to older torpedo target seekers. Some different models for 211u001edistributed sources are discussed as possible models of reverberation. A number 211u001eof methods to estimate the parameters of this kind of sources are evaluated by 211u001enumerical simulations. The following methods are compared: DSPE, DISPARE, WSF, 211u001eMUSIC, DML, Spread-MODE and WLS. The result was that all these methods were very 211u001esensible to modeling errors. Point source methods are also discussed and beam 211u001espace transforms are introduced to reduce the computational cost. The report is a 211u001eMaster of Science Thesis at Chalmers University of Technology.