Abstract
The performance of an underwater acoustic array is dependent upon its gain in the presence of noise. While isotropic noise is often utilized for simplistic considerations of system performance, such analyses are of limited validity because ambient sea noise is significantly directional. Thus, it is necessary to evaluate the behavior of arrays having many elements and multi-dimensional configurations in realistic anisotropic sea noise. Such computations have been very expensive using very large computers and impossible or impractical with other computers. This paper describes a technique comparable to a multi-dimensional FFT for radically reduced cost for the computation of array gain of lattice-shaped arrays of one, two, or three dimensions. The computational aspects are discussed. Typical results are presented for various horizontal and vertical arrays and compared with the author's prior work reported at EASCON '75 and the Ninth International Congress on Acoustics, 1977.
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