Automatic position calculating imaging radar with low-cost synthetic aperture sensor for imaging layered media
March 1, 2016. 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 ReferencesApparatus for generating a feature matrix based on normalized out-class and in-class variation matrices Vector neural network for low signal-to-noise ratio detection of a target Method and apparatus for determining and organizing feature vectors for neural network recognition Real-time holographic surveillance system Pattern recognition system Real-time wideband holographic surveillance system Patent #: 5557283 InventorApplicationNo. 609812 filed on 03/01/1996US Classes:342/22, TRANSMISSION THROUGH MEDIA OTHER THAN AIR OR FREE SPACE342/25D, With frequency domain processing of the SAR signals in azimuth (EPO)342/179, Image production342/180, Stereoscopic or tridimensional342/196, Fast fourier transform (FFT)342/197With video quantizerExaminersPrimary: Sotomayor, John B.Attorney, Agent or FirmInternational ClassesG01S 013/89G01S 013/90 AbstractAn imaging system for analyzing structures comprises a radar transmitter and receiver connected to a timing mechanism that allows a radar echo sample to be taken at a variety of delay times for each radar pulse transmission. The radar transmitter and receiver are coupled to a position determining system that provides the x,y position on a surface for each group of samples measured for a volume from the surface. The radar transmitter and receiver are moved about the surface to collect such groups of measurements from a variety of x,y positions. Return signal amplitudes represent the relative reflectivity of objects within the volume and the delay in receiving each signal echo represents the depth at which the object lays in the volume and the propagation speeds of the intervening material layers. Successively deeper z-planes are backward propagated from one layer to the next with an adjustment for variations in the expected propagation velocities of the material layers that lie between adjacent z-planes.Other References
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