Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1979-12-17
1981-12-08
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
G91S 1542
Patent
active
043051413
ABSTRACT:
A portable sonar surveillance system is disclosed which operates in the audible-frequency region where low attenuation loss minimizes the power requirement for achieving long-range detection capability. A light-weight, high-power transmitting transducer array approximately 1 ft. diameter, which operates efficiently in the 4-6 kHz range, is utilized in combination with a novel tri-cardioid hydrophone receiving array whose diameter is only a few inches to achieve a bearing resolution of 5.degree.. The inventive system replaces enormous sized conventional low-frequency scanning sonar systems weighing tens of thousands of pounds. The disclosed system can be very effectively used as a long-range, light-weight "dunking sonar" for submarine surveillance patrol operations from helicopters or small patrol craft. The disclosed sonar system is economically practical for use in the 1 kHz frequency region, thus achieving ultra-long-range detection capability which cannot be obtained with conventional scanning sonar systems.
REFERENCES:
patent: 2787736 (1957-04-01), Ellison et al.
Farley Richard A.
The Stoneleigh Trust
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