Method of measuring directional spectra of surface gravity waves

Details Method of measuring directional spectra of surface gravity waves Method of measuring directional spectra of surface gravity waves

1991-08-13

1993-09-07

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Underwater system

367136, 367 15, 367124, G01S 380

Patent

active

052435652

ABSTRACT:
A new method for measurement of the directional spectra of surface gravity (water) waves. Measurements are made at a single point by orthogonally mounted seismometers buried below the seabed surface and a pressure sensor resting on the seafloor or buried below the seabed. The maximum entropy principle is used to find the directional distribution function for the waves traveling through the sediments as measured by the seismometers. This function is combined with the frequency spectra of the ocean surface waves to form the directional spectra of the surface gravity waves. The method produced high directional resolution for instruments that were adequately coupled with the seabed. The method is also capable of detecting objects moving through water, such as surface ships and submarines.

REFERENCES:
patent: 4807199 (1989-02-01), Yamamoto et al.
patent: 4951264 (1990-08-01), Yamamoto et al.

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