Communications – electrical: acoustic wave systems and devices – Echo systems – Speed determination
Patent
1998-08-04
2000-04-18
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Echo systems
Speed determination
G01S 1558
Patent
active
060523344
ABSTRACT:
A system and method for measuring the directional spectrum of one or more waves in a fluid medium using a multi-beam sonar system. In an exemplary embodiment, range cells located within a plurality of acoustic beams are sampled to provide current velocity data. Optionally, wave surface height and pressure data is obtained as well. This velocity, wave height, and pressure data is Fourier-transformed by one or more signal processors within the system, and a surface height spectrum produced. A cross-spectral coefficient matrix at each observed frequency is also generated from this data. A sensitivity vector specifically related to the ADCP's transducer array geometry is used in conjunction with maximum likelihood method (MLM), iterative maximum likelihood method (IMLM), or other similar methods to solve a the wave equation at each frequency and produce a frequency-specific wave directional spectrum. Ultimately, the frequency-specific spectra are combined to construct a complete two-dimensional wave directional spectrum. The system is also capable of measuring current profile as a function of depth in conjunction with wave direction and wave height.
REFERENCES:
patent: 4062237 (1977-12-01), Fox
patent: 5208785 (1993-05-01), Brumley et al.
Glad, I.K., et al. (1992) The maximum-likelihood property of estimators of wave parameters from heave, pitch, and roll buoys. American Meteorological Society V.9:169-173.
Hashimoto, N., et al. (1996) Improvement of submerged Doppler-type directional wave meter and its application to field observations. Coastal Engineering 629-642.
Herbers, T.H., et al. (1991) Field Verification of Acoustic Doppler Surface Gravity Wave Measurements. Journal of Geophysical Research V.96,No. C9:17,023-17,035.
Krogstad, H.E., et al. (1988) High-resolution directional wave spectra from horizontally mounted acoustic Doppler current meters. Journal of Atmospheric and Oceanic Technology V.5,No. 4:340-352.
Pinkel, R., et al. (1987) Open ocean surface wave measurement using Doppler sonar. Journal of Geophysical Research V.92,No. C12:12,967-12,973.
Smith, J.A. (1989) Doppler sonar and surface waves: range and resolution. Journal of Atmospheric and Oceanic Technology V6:680-696.
Smith, J.A., et al. (1995) Directional surface wave estimates from Doppler sonar data. Journal of Atmospheric and Oceanic Technology V.12:617-632.
Stockhausen, W.T. (1994) Directional wave spectra using an acoustic doppler current profiler. A Thesis. Library of the Virginia Institute of Marine Science.
Takayama, T., et al. (1994) Development of a submerged Doppler-type directional wave meter. Coastal Engineering C.46:624-634.
Terray, E.A., et al. (1990) Measuring wave direction using upward-looking Doppler sonar. Proceedings of the IEEE Fourth Working Conference on Current Measurement 1-6 and Fig.1-Fig.4.
Terray, E., et al. (1997) Measuring wave height and direction using upward-looking ADCPs. IEEE Oceans '97 1-4.
Visbeck, M., et al. (1995) Sea surface conditions remotely sensed by upward-looking ADCPs. Journal of Atmospheric and Oceanic Technology V12:141-149.
Zedel, L. (1994) Deep ocean wave measurements using a vertically oriented sonar. Journal of Atmospheric and Ocean Technology V.11:182-191.
Brumley Blair H.
Strong Brandon S.
Terray Eugene A.
Pihulic Daniel T.
Rowe-Deines Instruments
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