Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1979-03-02
1981-01-27
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
367111, G01S 1514
Patent
active
042479240
ABSTRACT:
A proximity indicator, for example to indicate a safe height of release of a lifeboat, uses pulsed sonar to trigger a bistable circuit into a set state by the transmitted pulses and a reset state by received pulses which exceed a predetermined level. Red and green LEDs are energized when the bistable is set and reset respectively so that green predominates when a safe height is reached.
REFERENCES:
patent: 3125754 (1967-03-01), Reumerman et al.
patent: 3412390 (1968-11-01), Nelkin et al.
patent: 3548370 (1970-12-01), Hoxsie
patent: 3740705 (1973-06-01), Lowrance
patent: 3787803 (1974-01-01), Beebe
patent: 4064478 (1977-12-01), Honda
Farley Richard A.
National Research Development Corporation
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