Method and apparatus for classifying targets
Patent 5337053 Issued on August 9, 1994. Estimated Expiration Date: 
October 22, 2013. 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.
October 22, 2013. 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 ReferencesSonar system Method of extracting target range and Doppler information from a Doppler-spread signal Patent #: 5091890 InventorApplicationNo. 147238 filed on 10/22/1993US Classes:342/90, Automatic target detection342/22, TRANSMISSION THROUGH MEDIA OTHER THAN AIR OR FREE SPACE342/192, Spectrum analysis342/194, Complex signal (in phase and quadrature)342/195, Digital processing367/99, Distance or direction finding367/904DOPPLER COMPENSATION SYSTEMSExaminersPrimary: Sotomayor, John B.Attorney, Agent or FirmInternational ClassesG01S 007/292G01S 015/00 G01S 007/52 AbstractA method and apparatus for classifying objects based upon information conned in the fourth order cumulant derived from energy from the object. Successive pulse returns in active systems and samples in passive systems are converted into vectors based upon the fourth order cumulant information for each successive return or sample. The vectors for each such pulse are compared to corresponding class information based upon the corresponding fourth order cumulant information. The comparison uses loglikelihood ratios of the different pairs of classes. Decision making is based upon the value of each loglikelihood ratio in comparison with a class threshold. | |
