High resolution acoustic navigation system
Patent 4176338 Issued on November 27, 1979. Estimated Expiration Date: 
August 31, 1997. 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.
August 31, 1997. 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 3421138 3860900 3928840 Position control system for a subsea vehicle Patent #: 4017823 InventorsApplicationNo. 05/829344 filed on 08/31/1977US Classes:367/6, With plurality of transponders367/117, PLURAL TRANSMITTERS TO RECEIVER OR TRANSMITTER TO PLURAL RECEIVERS367/125, Phase comparison and/or correlation701/200NAVIGATIONExaminersPrimary: Farley, Richard A.Attorney, Agent or FirmInternational ClassesG01S 15/00 (20060101)G01S 15/66 (20060101) G01S 5/24 (20060101) G01S 5/00 (20060101) AbstractA high resolution underwater acoustic navigation system is provided by a combined pulse and continuous-wave or Doppler system. Locations of the object being tracked are periodically determined by the pulse subsystem and are used to initialize the Doppler subsystem. The Doppler Subsystem tracks the location from the fix obtained by the pulse subsystem. Both subsystems are interfaced with a central processing unit or digital computer and the data rate input to the computer is substantially reduced by the use, in the Doppler subsystem, of a phase angle quadrant change counter whose accumulated count is periodically provided as an input to the computer.Other References
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