Method for changing the frequency for sampling sonar wavefronts

Communications – electrical: acoustic wave systems and devices – Distance or direction finding – With plurality of transducers

Reexamination Certificate

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C367S119000, C367S124000, C367S130000

Reexamination Certificate

active

06847588

ABSTRACT:
A system and method for processing sonar information from an underwater hydrophone array, at frequencies having wavelengths less than two times a spacing between adjacent hydrophones. The method and system all for processing received underwater waveforms at high frequency limits beyond the mechanical limits of the array.

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Stergiopoulos, Stergios, et al. “Extended Towed Array Processing By an Overlap Correlator.” J. Acoust. Soc. Am. 86 (1), Jul. 1989.
Stergiopoulos, Stergios, et al. “Implementation of a Synthetic Aperture Processing Scheme In a Towed Array Sonar System.” J. Acoust. Soc. Am., vol. 95, No. 5, Pt. 2, May 1994.
Carey, William M., “Comments On ‘Passive Synthetic Arrays’ [J. Acoust. Soc. Am. 84, 592-598 (1988)].” J. Acoust. Soc. Am. 85(3), Mar. 1989.
Colin, M.E.G.D., et al. “Passive Synthetic Aperture Sonar Techniques In Combination With Tow Ship Noise Canceling: Application To a Triplet Towed Array.” IEEE, 2002.
Kim, Keonwook, et al.; “Parallel Subspace Projection Beamforming For Autonomous, Passive Sonar Signal Processing.” High-performance Computing and Simulation (HCS).

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