Properties of the beam noise distribution function for horizontal arrays in ship-induced noise fields
An analysis is presented of the environmental and array system factors governing the fluctuations in the beam noise of a horizontal array in a ship-induced noise field. A model is used that relates the cumulative distribution function to the directivity and side-lobe characteristics of the system an...
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Veröffentlicht in: | The Journal of the Acoustical Society of America 1984-05, Vol.75 (S1), p.S63-S63 |
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Format: | Artikel |
Sprache: | eng |
Online-Zugang: | Volltext |
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Zusammenfassung: | An analysis is presented of the environmental and array system factors governing the fluctuations in the beam noise of a horizontal array in a ship-induced noise field. A model is used that relates the cumulative distribution function to the directivity and side-lobe characteristics of the system and the strength and anisotropy of the shipping distribution. The results are threefold. First, for a given environment, an increase in the array length results in a large increase in the prevalance of low noise periods at the expense of a modest increase of high noise periods. Second, for sufficiently large apertures, a “noise floor” develops in that noise values larger than the noise floor occur with high probability, whereas values less than the noise floor occur only rarely. Finally, the noise floor level is essentially independent of the noise anisotropy and of further increases in aperture length, and it increases with degradation in side-lobe level. |
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ISSN: | 0001-4966 1520-8524 |
DOI: | 10.1121/1.2021532 |