Title: Radar-barometric altitude indicator

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.

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Inventors: Andresen, Jr., John H. (Georgetown, WI, US)

Application Number: 473514
Filing Date: 1974-05-28
Publication_date: 1976-02-03
Assignee: Intercontinental Dynamics Corporation (Englewood, NJ)
Primary Class(es): 340/977 340/815.78, 342/120
Other Classes:
US Patent Ref:

3537086	Oct, 1970	Andresen	340/27.
3601791	Aug, 1971	Emerson	340/27.
3715718	Feb, 1973	Astengo	340/27.

Other Refs:
Primary Examiner: Tubbesing, T. H.
Assistant Examiner:
Attorney: Ostrolenk, Faber, Gerb & Soffen