Moving map display providing various shaded regions per altitude for aircraft navigation
First Claim
1. A moving map display for use in an aircraft based on data recorded on a photographic film having a series of pictures, said data corresponding to altitude surveys coded in accordance with a plurality of predetermined shades and colors in order to cover a total altitude range with a desired precision, said display comprising:
- a point-by-point analysis device of the film supplying video signals;
control means for receiving and processing different synchronization and control signals and receiving from an auxiliary altimeter, altitude information of the aircraft and for producing a plurality of n fixed altitude values, each of said n altitude values being smaller than said altitude of the aircraft and which subdivide the said altitude of the aircraft into n+1 regions, each having a predetermined height;
a processing circuit for decoding said video signals in real time by identifying the shade or color of each point on said map and determining from a table of values in memory based on said identified shade or color the altitude of said point corresponding thereto, a plurality of n comparators for comparing the altitude of said point with each of said n altitude values and determining in which region said point is located, a transcoder receiving the output of said comparators for producing color information used for display purposes corresponding to each of these regions; and
means for cathode displaying said color information.
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Accused Products
Abstract
The moving map display screen makes it possible to display the relief of the area overflown by an aircraft as a function of the altitude of the latter.
A moving-spot video reader analyses by radial scanning the relief of the area to be overflown and recorded on a film. In a processing circuit, the instantaneous altitude of the analyzed point is supplied in digital form to three comparators, where it is compared to three different values as a function of the aircraft altimeter. The result of this comparison makes it possible to classify this altitude in a range relative to the instantaneous altitude of the aircraft. A transcoder allocates to each range a particular digital value corresponding to a given shade. A display means reproduces the relief of the analyzed area with the aid of several conventional shades.
28 Citations
17 Claims
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1. A moving map display for use in an aircraft based on data recorded on a photographic film having a series of pictures, said data corresponding to altitude surveys coded in accordance with a plurality of predetermined shades and colors in order to cover a total altitude range with a desired precision, said display comprising:
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a point-by-point analysis device of the film supplying video signals; control means for receiving and processing different synchronization and control signals and receiving from an auxiliary altimeter, altitude information of the aircraft and for producing a plurality of n fixed altitude values, each of said n altitude values being smaller than said altitude of the aircraft and which subdivide the said altitude of the aircraft into n+1 regions, each having a predetermined height; a processing circuit for decoding said video signals in real time by identifying the shade or color of each point on said map and determining from a table of values in memory based on said identified shade or color the altitude of said point corresponding thereto, a plurality of n comparators for comparing the altitude of said point with each of said n altitude values and determining in which region said point is located, a transcoder receiving the output of said comparators for producing color information used for display purposes corresponding to each of these regions; and means for cathode displaying said color information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification