Measuring and testing – Navigation – Take-off and landing monitors
Patent
1977-11-25
1979-09-11
Woodiel, Donald O.
Measuring and testing
Navigation
Take-off and landing monitors
350174, 358250, G01C 2100
Patent
active
041671139
ABSTRACT:
A head-up display system for an aircraft has a display unit which projects a display of symbology representing the aircraft flight parameters onto a separately mounted partially-transparent reflector positioned in front of the aircraft pilot, so that the pilot sees an image of the display against the external scene. The display unit has a sensor which receives an image of the display via the reflector. The sensor responds to displacement of this image from a reference established with respect to the display unit, caused by movement of the reflector relative to the display unit, and the display is correspondingly modified to compensate for such movement. The display unit may include a cathode-ray tube for providing the display which can be modified by adjustment of the deflection of the cathode-ray beam. In this case the reference established with respect to the display unit may be an instantaneous point image of the cathode-ray beam. A light source may be mounted with the display unit and the sensor may be arranged to respond additionally to displacement of an image of this light source received via the reflector. The light source may be located at a position spaced from the center of the display. Two sensors may be provided in the display unit, one of which receives an image of the display directly from within the unit, and the other of which receives an image of the display via the reflector, the display being modified in accordance with the difference between the outputs of the two sensors. The sensors may each be formed by a matrix array of photo-responsive devices.
REFERENCES:
patent: 3205303 (1965-09-01), Bradley
Smiths Industries Limited
Woodiel Donald O.
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