Radar system and method for detecting and discriminating targets from a safe distance
June 6, 2015. 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 ReferencesProcess and apparatus for geotechnic exploration Earth probing radar system Radar apparatus Subsurface inspection radar Ground probing radar method and apparatus Efficient operation of probing radar in absorbing media Ground probing radar with multiple antenna capability System and method for earth probing with deep subsurface penetration using low frequency electromagnetic signals Gated FMCW DF radar and signal processing for range/doppler/angle determination Patent #: 5361072 InventorsApplicationNo. 466938 filed on 06/06/1995US Classes:342/22TRANSMISSION THROUGH MEDIA OTHER THAN AIR OR FREE SPACEExaminersPrimary: Pihulic, Daniel T.Attorney, Agent or FirmInternational ClassesG01S 013/24G01S 007/41 AbstractA frequency-agile, narrow-instantaneous bandwidth radar system detects objects, and discriminates between different types of objects, from a safe stand-off distance. Transmit circuitry transmits a train of continuous wave signals in a multitude of stepped operating frequencies that illuminates the target area. Return signals from the target area are received through at least a pair of spaced-apart receive antennas. Signal receive/processing circuitry coupled to the spaced-apart receive antennas selectively combines and processes the return signals to identify variations in the received signals indicative of the presence of a specific type of object. At each of the stepped frequencies, the system noise and the clutter of the signals is reduced by averaging and smoothing the incoming data and the cross-power spectrum at each frequency is calculated. Using the information of the power spectra of all frequencies, the Mahalanobis distance is defined and the presence and classification of a target is determined. Using the information of the cross-power spectra of all frequencies, the location of the mine is determined by the azimuth angle and echo time.Other References
Field of SearchTRANSMISSION THROUGH MEDIA OTHER THAN AIR OR FREE SPACEAutomatic target detection Combined with determining direction Combined with determining direction PRESENCE DETECTION ONLY Plural frequencies transmitted Plural modulation Combined with pulse modulation (e.g., frequency agile) With pulse modulation (e.g., "Chirp") For frequency modulation Combined with pulse modulation For pulse modulation With noise reduction | |
