David A Grande, 52Phoenix, AZ

5568450, Oct 22, 1996

Oct 18, 1994

8/330143

David W. Grande - North Stonington CT
Michael T. Sundvik - Narragansett RI
Judith L. Bishop - Waterford CT
Bernard F. Cole - New London CT

The United States of America as represented by the Secretary of the Navy - Washington DC

H04B 1100
G01S 1500

367131

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.

5339288, Aug 16, 1994

Jul 12, 1993

8/089913

Darren J. Blier - Westerly RI
Christopher J. Dubord - Niantic CT
David W. Grande - Bradford RI

The United States of America as represented by the Secretary of the Navy - Washington DC

H04R 2300

367145

An underwater sound source with a remote controlled actuator comprising a oy having a buoyant portion, a plurality of launch tubes storing acoustic charges, a radio transceiver, control circuitry, hinged doors at the bottom of the tubes, and a safety release circuit. The hinged doors are secured by pneumatic actuators to allow a selected door to open on a radio signal from a remote location. The charges are pressure sensitive and will explode at a preselected depth. A launch platform can deploy the device and remove itself from the general vicinity of the test site. The device releases the charges on command from a transmitter aboard a vessel and reports on the status of the launch tube doors to a receiver aboard a vessel. A safety valve can be opened automatically or on power failure to insure that all acoustic charges have been discharged.