Reduction of low frequency vibrational noise in towed arrays

Details Reduction of low frequency vibrational noise in towed arrays Reduction of low frequency vibrational noise in towed arrays

1990-07-26

2008-11-25

Pihulic, Dan (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

C367S901000

Reexamination Certificate

active

07457197

ABSTRACT:
Low frequency vibration induced noise is reduced in a towed sonar array of the type comprising a number of oil-filled modules joined end to end with each module housing a plurality of hydrophones by arranging that the signal output from each hydrophone in an array is equally weighted at low frequencies to form a single channel. Beamforming is then carried out by applying different weights to the different module channels. High modulus internal strength members are included in each module to resist anti-phase vibration of the couplings at the end of the module. The hydrophone spacing and the coupling lengths are both made small compareed to the module length to improve vibration noise reduction.

REFERENCES:
patent: 4509151 (1985-04-01), Anderson
patent: 4737937 (1988-04-01), Keckler et al.
patent: 1230701 (1971-05-01), None
patent: 1435125 (1976-05-01), None
patent: 2145226 (1985-03-01), None
patent: 2366618 (2002-03-01), None
Journal of the Acoustical Society of America, vol. 75, No. 6, Jun. 1984 (New York), pp. 1837-1847 (“Hybrid time-Delay/Phase-Shift Digital (cont.) Beamforming for Uniform Collinear Arrays”, R. A. Gabel and R.R. Kurth, see especially the sub-arrays in Figure 2, p. 1839).

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