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Primary Examiner: Reger, Duane A.
Assistant Examiner: Kunin, Stephen G.
Attorney: Killingsworth; Ted E., McMurry; Michael B.

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Title: Terrain closure warning system with altitude rate signal conditioning

Abstract: In an aircraft terrain warning system utilizing a radar altimeter wherein the rate of closure to the terrain is compared with the aircraft's altitude above the terrain to generate a warning signal when the closure rate is excessive for a particular altitude, the closure rate signal is limited and biased depending upon the aircraft's closure rate and configuration in order to significantly increase the time response of the system while at the same time reducing nuisance warnings. The amplitude limit on the closure rate signal, is varied, above a predefined altitude, as a function of the closure rate signal in oreder to provide increased warning times at greater closure rates. Circuitry, responsive to the aircraft's flap positions, is also provided to alter the characteristics of rate limiter so as to provide warning parameters that more accurately reflect operating conditions at lower aircraft speeds.

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Inventors: Bateman, Charles Donald (Bellevue, WA, US)
Muller, Hans Rudolf (Kirkland, WA, US)

Application Number: 556022
Filing Date: 1975-03-06
Publication_date: 1976-01-20
Assignee: Sundstrand Data Control, Inc. (Redmond, WA)
Primary Class(es): 340/970 73/178R, 244/182, 342/65, 342/455, 701/223, 701/301
Other Classes:
US Patent Ref:

2702342	Feb, 1955	Korman	343/112.
2735081	Feb, 1956	Hosford	340/27.
2851120	Sep, 1958	Fogiel	343/112.
2930035	Mar, 1960	Altekruse	343/7.
2931221	Apr, 1960	Rusk	73/179.
3077557	Feb, 1963	Joline et al.	244/77.
3093807	Jun, 1963	Crane et al.	73/179.
3140483	Jul, 1964	Sikora et al.	343/7.
3210760	Oct, 1965	Olson et al.	343/7.
3245076	Apr, 1966	LeTilley et al.	343/7.
3248728	Apr, 1966	Garfield et al.	343/7.
3510092	May, 1970	Hendirck et al.	244/77.
3715718	Feb, 1973	Astengo	340/27.
3743221	Jul, 1973	Lykken et al.	244/77.
3776518	Oct, 1973	Rilett	343/7.
3892373	Jul, 1975	Doniger	244/77.

Other Refs: Other References: Brantley, James Q., Radar Offers Solution To Midair Plane Collisions, Electronics, 11-1954, pp. 146-150.