Choke point bistatic sonar
Patent 5235558 Issued on August 10, 1993. Estimated Expiration Date: 
May 21, 2012. 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 21, 2012. 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 ReferencesSaturation limited parametric sonar source Aplanatic geophysical exploration system Barrier sonar Patent #: 4939702 InventorsAssigneeApplicationNo. 887204 filed on 05/21/1992US Classes:367/92, Parametric sonar367/15, Offshore prospecting367/104, By transducer movement367/908MATERIAL LEVEL DETECTION, E.G., LIQUID LEVELExaminersPrimary: Pihulic, Daniel T.Attorney, Agent or FirmInternational ClassG01S 015/00AbstractA sonar system for use in a water body includes a projector on the bottom of a water body for generating and transmitting a direct beam of acoustic energy. A receiving array is immersed in the water body outside the direct beam for detecting reflections from an target in the direct beam. The receiving array may be a horizontal or vertical linear array of hydrophones in the water body. The array of hydrophones may have output signals coupled to an A/D convertor and a multiplexor for digitizing and multiplexing the signals to prepare for transmission and analysis of the signals. A pair of separated projectors on the bottom of the water body may generate parametric acoustic arrays for transmitting direct beams of acoustic energy through the water body towards each other. A receiving array immersed in the water body outside the direct beams detect any reflections from an object in the acoustic beams. | |
