Accession Number : ADA247502

Title :   Beamforming with Dolph-Chebyshev Optimization and Other Conventional Methods.

Descriptive Note : Final rept.,

Corporate Author : NAVAL OCEANOGRAPHIC AND ATMOSPHERIC RESEARCH LAB STENNIS SPACE CENTER MS

Personal Author(s) : George, J.

Report Date : OCT 1991

Pagination or Media Count : 42

Abstract : In conventional beamforming, several 'shading' methods are available to optimize the mainlobe width and the sidelobe levels for specific situations. These include Gaussian, Hann, and Dolph-Chebyshev methods. The Dolph-Chebyshev optimization method is of special interest, because it allows minimization of mainlobe width for a specific sidelobe level. Perhaps the best account of the Dolph-Chebyshev method in the widely available literature is found in a book by Albers, where the method is described only in terms of specific examples. In order to facilitate the Dolph-Chebyshev computation for an arbitrary number N (even or odd) of phones, a convenient set of recursion relations are presented in this technical note. A listing of our FORTRAN program 'Steer,' and graphical examples are given, comparing the features of the different methods.

Descriptors :   *UNDERWATER ACOUSTICS, *BEAM FORMING, ACOUSTICS, AMBIENT NOISE, COMPUTATIONS, FORTRAN, NOISE, OPTIMIZATION, PROPAGATION, SCATTERING, SIDELOBES, SURFACES, UNDERWATER, WIDTH, ACOUSTIC WAVES, WAVE PROPAGATION, HYDROPHONES, ACOUSTIC ARRAYS.

Subject Categories : Acoustics
      Target Direction, Range and Position Finding

Distribution Statement : APPROVED FOR PUBLIC RELEASE