Author(s): C. T. Stansberg; S. Ishida
Linked Author(s):
Keywords: No Keywords
Abstract: The Fourier series expansion of a directional spectrum is shown to be equiva-lent to a Fourier series expansion of the corresponding spatial coherence function (normalized cross-spectrum) of the wave elevation if the wave eleva-tion is recorded at points on a circle. A directional spectrum estimation method based on this principle is proposed. The method is optimalized by a particular combination of point pairs, and by a Maximum Entropy Assumption (MEM) for extrapolation to Fourier coefficients with. higher orders. Numerical test examples with an 8-point circular array show reasonably good agreement between input and estimates for both single-peak and double-peak spectra.
Year: 1989