Adjustable frequency diversity acoustic communications system
Patent 5018114 Issued on May 21, 1991. Estimated Expiration Date: 
December 13, 2008. 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.
December 13, 2008. 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 ReferencesTime diversity data transmission apparatus Minimization of multipath and doppler effects in radiant energy communication systems Patent #: 4349915 InventorsApplicationNo. 284004 filed on 12/13/1988US Classes:367/134TelemeteringExaminersPrimary: Tarcza, Thomas H.Assistant: Pihulic, Daniel T. Attorney, Agent or FirmInternational ClassH04B 011/00AbstractAn underwater acoustic communication system provides an operator with adjable frequency diversity so that data rates may be tailored to specific multipath environments. Transmitted messages are sent with precursor transmission/reception synchronization data and transmission parameter data so that the receiving communication end will recognize when message data starts, tone length as-well-as the frequency diversity of the transmitted message. Timing is extracted from the data to compensate for Doppler shift. | |
