Processing techniques for circular sonar arrays

Author

Griffiths, H.D. ; Griffiths, H.D. ; Cowan, C.F.N. ; Eiges, K. ; Rafik, T.

Author_Institution

Univ. Coll. London, UK

fYear

1994

fDate

19-21 Jul 1994

Firstpage

67

Lastpage

72

Abstract

Briefly reviews the properties of modally-excited circular and cylindrical arrays and their application to sonar systems. The authors present the basis of two new techniques, namely: (i) sectoral phase modes, which are directional patterns with the same spatial variation of phase as phase modes, allowing direction finding with improved immunity to interference, and (ii) the application of superresolution techniques to circular arrays, which have particular benefits in operating with correlated signals. Both these techniques are usable over broad bandwidths (two octaves or more) using digital filtering techniques to compensate the variation of phase modes as a function of frequency

Keywords

acoustic signal processing; array signal processing; filtering and prediction theory; sonar; underwater sound; circular sonar arrays; correlated signals; digital filtering techniques; direction finding; directional patterns; interference; modally-excited circular arrays; modally-excited cylindrical arrays; phase; phase modes; sectoral phase modes; sonar systems; spatial variation; superresolution techniques;

fLanguage

English

Publisher

iet

Conference_Titel

Electronic Engineering in Oceanography, 1994., Sixth International Conference on

Conference_Location

Cambridge

Print_ISBN

0-85296-619-9

Type

conf

DOI

10.1049/cp:19940577

Filename

337081