Digital sonar system
Patent 5469403 Issued on November 21, 1995. Estimated Expiration Date: 
November 21, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 21, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3786405 Underwater transponder calibration arrangement Method for shaping and aiming narrow beams Sonar transceiver system and method Data selector circuit with channel skipper for data acquisition system Acoustic self-guidance systems for submarine vehicles Enhanced bottom sonar system Patent #: 5025423 InventorsAssigneeApplicationNo. 929881 filed on 08/11/1992US Classes:367/6, With plurality of transponders367/125, Phase comparison and/or correlation367/134TelemeteringExaminersPrimary: Pihulic, Daniel T.Attorney, Agent or FirmInternational ClassH04B 001/59AbstractA transponder of an active digital sonar system identifies a multifrequency underwater activating sonar signal received from a remote sonar transmitter. The transponder includes a transducer that receives acoustic waves, including the activating sonar signal, and generates an analog electrical receipt signal. The analog electrical receipt signal is converted to a digital receipt signal and cross-correlated with a digital transmission signal pattern corresponding to the activating sonar signal. A relative peak in the cross-correlation value is indicative of the activating sonar signal having been received by the transponder. In response to identifying the activating sonar signal, the transponder transmits a responding multifrequency sonar signal.Other References
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