The spatial least mean-square (LMS) sense cancellation of acoustic interferences, with finite but narrow angular extent, from the output of a primary sensor using reference hydrophones spatially separated from the primary is considered. This is done by replacing adaptive LMS filters in the canceler structure with continuous Wiener filters. A far-field model for a narrow extended source impinging on a line array of hydrophones is developed and used to determine the canceler output spectrum. Lower bounds on the canceler output spectrum are developed for arbitrary but narrow source distribution. For the special case of a spatially uncorrelated, uniformly distributed narrow interference, the cancellation is evaluated as a function of the number of reference hydrophones, the position of the reference relative to the primary sensor, and the angular extent of the interference. Explicit approximations for the cancellation achieved with such a source are developed, and design guidelines are described for the selection of reference hydrophone position and the number of references. Several significant differences between cancellation of single plane wave and narrow extended sources are demonstrated.
The LMS cancellation of narrow, extended interferences in sonar
Die LMS-Unterdrueckung schmalbandiger Sonar-Stoerungen
IEEE Transactions on Acoustics, Speech and Signal Processing ; ASSP-33 , 4 ; 788-805
1985
18 Seiten, 21 Quellen
Article (Journal)
English
Association of narrow band sources in passive sonar
IEEE | 2002
|Engineering Index Backfile | 1932
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