DIRECTIONAL ACCURACY OF SMALL RING ARRAYS

Authors
  1. Maksym, J.N.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Estimation of the bearing of a far-field signal source with a small-diameter circular array of hydrophones is studied in the paper. It is shown that for isotropic far-field noise the Cramer-Rao bound can be simply evaluated via a spatial harmonic representation of the array response. Use of the derived expression for practical bearing estimators employing superdirectivity is justified by showing the equivalence between maximum likelihood estimate and one obtained by the formation of superdirective beams. An expression for the average bias resulting from anisotropy of the ambient noise field is also derived using a spatial harmonic representation.
Report Number
DREA-76-1 —
Date of publication
15 Sep 1976
Number of Pages
7
Reprinted from
J Acoust Soc Am, vol 61, no 1, 1977, p 105-109
DSTKIM No
77-01952
CANDIS No
102511
Format(s):
Hardcopy;Originator's fiche received by DSIS

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