Proximity indicating equipment

Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding

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Details

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

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