Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1973-11-02
1990-12-25
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
367904, G01S 1500
Patent
active
049808680
ABSTRACT:
A doppler compensated sonar system is disclosed as including a transmitter nd a receiver. The receiver of the disclosed preferred embodiment is a single channel receiver which incorporates a mixer and a narrow pass band filter connected in series therein. A phase lock loop of the negative feedback type is connected between the control input and the output of said mixer which effectively determines the occurrence of any doppler effects being processed in said receiver channel and compensates therefor by appropriate adjustment of the frequency of the signal supplied to the control input of said mixer, thereby causing the remainder of said receiver channel, including said narrow band pass filter, to process received target signals without any doppler effects being present therein. When mounted on a fast moving marine vehicle, this doppler compensated sonar system aids considerably in the avoidance of floating logs, submerged tree stumps, and other hazardous objects and debris thereby during the navigation thereof through uncharted waters.
REFERENCES:
patent: 3202960 (1965-08-01), Galbraith
patent: 3295127 (1966-12-01), Kross
patent: 3525976 (1970-08-01), Wilcox
patent: 3646506 (1972-02-01), Suter
patent: 3663932 (1972-05-01), Mount
Becker John
David Harvey
Pihulic Daniel T.
Sheinbein Sol
Tarcza Thomas H.
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