Communications – electrical: acoustic wave systems and devices – Underwater system
Patent
1994-10-18
1996-10-22
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Underwater system
367 88, H04B 1100, G01S 1500
Patent
active
055684505
ABSTRACT:
A system for characterizing ocean bottom properties in real-time by explong the multipath structure of reverberation to extract values for the bottom loss and the bottom scattering coefficient. The system obtains environmental and navigational data and synchronizes the data with sonar state data and acoustic beam data to produce an input data stream to an extraction processor. The extraction processor utilizes a digital signal processing means to produce a reverberation energy envelope from the acoustic beam data and time correlate the reverberation energy envelope with the environmental, navigational, and sonar state data. A general purpose computer monitors the reverberation envelope and the environmental, navigational, and sonar state data for change and instructs a modeling processor to construct a new eigenray propagation model and a new reference reverberation model if any changes occur in the data that results in a change to the previously constructed eigenray propagation or reference reverberation models. A pair of local extraction processors perform the extraction of the bottom loss and the bottom scattering coefficient by performing a probe pulse extraction algorithm and a reverberation decay algorithm, respectively.
REFERENCES:
patent: 3555499 (1971-01-01), MacDonald et al.
patent: 4796238 (1989-01-01), Bourgeois et al.
patent: 5126978 (1992-06-01), Chaum
Bishop Judith L.
Cole Bernard F.
Grande David W.
Sundvik Michael T.
Eipert William F.
Lall Prithvi C.
Lobo Ian J.
McGowan Michael J.
The United States of America as represented by the Secretary of
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