Communications – electrical: acoustic wave systems and devices – Echo systems – Side scanning or contour mapping sonar systems
Patent
1993-04-27
1994-06-14
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Echo systems
Side scanning or contour mapping sonar systems
G01S 1500, G01S 1589
Patent
active
053216679
ABSTRACT:
A sonar system is provided for mapping the bottom of a body of water to identify a submerged foreign object. A sequence of the sonar pulses is transmitted and directed toward the bottom. The mapping is formed from a sequence of echo returns. Each one of the echo returns is produced as a range scan in a range direction response to a corresponding one of the transmitted sonar pulses. The sonar system stores signals representative of the intensity of the echo returns in a two dimensional array of pixels. Each one of the pixels represents the intensity of the echo return at a predetermined range position from the system in the range direction and a predetermined cross-range position from a reference position of the system in the cross-range direction. The system quantizes the intensity of each one of the pixels into one of a plurality of levels, and compares the distribution of the levels of pixels over a range scan at a cross-range position with the distribution of levels of pixels over a range scan having a different cross-range position to identify the existence of an underwater object.
REFERENCES:
patent: 3943482 (1976-03-01), Murphree
patent: 3967233 (1976-06-01), Maguer et al.
patent: 3967234 (1976-06-01), Jones
patent: 4422166 (1983-12-01), Klein
patent: 4951268 (1990-08-01), Grall
patent: 5025423 (1991-06-01), Earp
patent: 5155706 (1992-10-01), Haley et al.
Audi Paul P.
Deaett Michael A.
Johnson Stephen G.
Lobo Ian J.
Mofford Donald F.
Raytheon Company
Sharkansky Richard M.
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