Method of extracting target range and Doppler information from a Doppler-spread signal
Patent 5091890 Issued on February 25, 1992. Estimated Expiration Date: 
May 20, 2011. 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.
May 20, 2011. 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.InventorApplicationNo. 702550 filed on 05/20/1991US Classes:367/99, Distance or direction finding367/904DOPPLER COMPENSATION SYSTEMSExaminersPrimary: Pihulic, Daniel T.Attorney, Agent or FirmInternational ClassG01S 015/00AbstractA method of extracting target range and Doppler information from a Dopplepread signal is provided. An acoustic waveform is transmitted underwater and impinges upon a submerged Doppler-spread target. Doppler-spread sonar echoes resulting from the transmitted waveform are received and digitized. The received sonar echo is separated into its inphase and quadrature components thereby forming a complex vector function. A fourth-order cumulant spectrum is generated from the complex vector function based upon three time delays. In order to extract the range and Doppler information from the Doppler-spread signal, the first of the time delays is set equal to zero while the second and third time delays are set equal to one another. | |
