Radar-barometric altitude indicator

Details Radar-barometric altitude indicator Radar-barometric altitude indicator

1974-05-28

1976-02-03

Tubbesing, T. H.

Communications: electrical

Selective

Having indication or alarm

340324R, 340 27NA, 343 12A, B64D 4300

Patent

active

039367975

ABSTRACT:
An aircraft instrumentation having inherent self-checking features. Radar and barometric altitude information are displayed on the dial face of a single instrument. A cooperating dial and first pointer displays barometric altitude. A manually settable indicator "bug" cooperates with the dial to provide a presentation of the height of the airstrip relative to sea level. A second indicator "bug" of a different shape from the landing field bug is servo-driven from both radar and barometric altitude signal inputs to provide a presentation of aircraft altitude relative to the terrain beneath the aircraft. The angle between the barometric altitude pointer and servoed radar altitude "bug," measured counterclockwise, constitutes the distance of the aircraft above the airstrip or other terrain which the aircraft is passing over. Upon touchdown both "bugs" should be in exact coincidence, thereby serving as a self-check upon accuracy of the instrumentation.

REFERENCES:
patent: 3537086 (1970-10-01), Andresen
patent: 3601791 (1971-08-01), Emerson
patent: 3715718 (1973-02-01), Astengo

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