Communications: electrical – Selective – Having indication or alarm
Patent
1975-04-02
1976-01-20
Blix, Trygve M.
Communications: electrical
Selective
Having indication or alarm
73178R, 2351502, 244 77D, 343 77A, 343112CA, 343112A, G01C 500
Patent
active
039342220
ABSTRACT:
In a terrain warning system wherein the rate of the aircraft's closure to the terrain is compared to the aircraft's altitude above the terrain in order to generate a warning signal for excessive closure rates, a circuit is provided to inhibit the warning signal when the aircraft begins to climb in response to the warning signal and to measure the altitude gained by the aircraft resulting in the reactivation of the warning signal if the aircraft has leveled off before gaining a predetermined amount of altitude. The circuit includes: a memory element to indicate that a warning signal has been generated; a circuit to generate a climb signal in response to a barometric rate of change signal indicating the aircraft is climbing; and an integrating circuit responsive to the barometric rate signal to determine the amount of altitude the aircraft has gained while climbing. If the aircraft has not gained the predetermined amount of altitude before leveling off, as indicated by the climb signal, the memory element will reactivate the warning signal.
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brantley, James Q. Radar Offers Solution to Midair Collisions, Electronics, 11-1954, pp. 146-150.
Bateman Charles Donald
Brem Frank Joseph
Muller Hans Rudolf
Blix Trygve M.
Killingsworth Ted E.
Kunin Stephen G.
McMurry Michael B.
Sundstrand Data Control Inc.
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