Communications: electrical – Selective – Having indication or alarm
Patent
1975-01-22
1976-03-30
Blix, Trygve M.
Communications: electrical
Selective
Having indication or alarm
73178R, 2351502, 244 77D, 343 7TA, 343112A, 343112CA, G01C 500
Patent
active
039478084
ABSTRACT:
In a system that compares the rate of descent of an aircraft with its altitude above ground and generates a warning signal when the sink rate exceeds a predetermined limit for a particular altitude, the maximum warning time is limited to a specified value in order to minimize nuisance warnings at higher altitudes. At a descent rate above a certain value, the excessive sink rate warning signal is inhibited for combinations of descent rates and aircraft altitudes which would provide a warning greater than a selected time to impact, such as 30 seconds.
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bramley, James Q., "Radar Offers Solution to Midair Collisions", Electronics, Nov., 1954, pp. 146-150.
Federal Aviation Administration Advisory Circular, "Ground Proximity Warning Systems", Dec. 31, 1974, pp. 1-5, AC No. 25-26.
Blix Trygve M.
Killingsworth Ted E.
Kunin Stephen G.
McMurry Michael B.
Sundstrand Data Control Inc.
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