초록 ▼

An aircraft display system positions a synthetic runway which is properly aligned with a target runway even during crosswind approaches. The relative position of the target runway is computed in a manner which reduces the accumulated error associated with previous systems. The lateral deviation rate

An aircraft display system positions a synthetic runway which is properly aligned with a target runway even during crosswind approaches. The relative position of the target runway is computed in a manner which reduces the accumulated error associated with previous systems. The lateral deviation rate of the aircraft relative to the extended centerline of the target runway is computed from data provided by various aircraft navigation and sensor systems. A track error angle representative of the difference between the extended centerline of the runway and the ground track of the aircraft is computed from the lateral deviation rate and ground speed. Runway bearing relative to ground track is computed from the track error angle and lateral deviation angle. Compensating runway bearing relative to ground track with drift angle yields a runway bearing relative to aircraft heading which is useful for positioning a synthetic runway on a display. The preferred application is for head up display systems during instrument flight conditions but can also be used on head down displays to provide proper correlation between the synthetic runway and the flight path vector symbol.

대표청구항 ▼

[ The embodiments of an invention in which an exclusive property or right is claimed are define as follows:] [1.] A display system for an aircraft comprising:a) an instrument landing system providing localizer deviation data and glideslope deviation data representative of the deviation of said aircr

[ The embodiments of an invention in which an exclusive property or right is claimed are define as follows:] [1.] A display system for an aircraft comprising:a) an instrument landing system providing localizer deviation data and glideslope deviation data representative of the deviation of said aircraft from a selected ILS flight path;b) means for providing altitude data representative of the altitude of said aircraft above a target runway;c) a database providing runway length data;d) means for providing ground speed data representative of the ground speed of said aircraft;e) means for computing a lateral deviation rate of said aircraft relative to the extended centerline of said target runway from said localizer deviation data, said glideslope deviation data, said altitude data, and said runway length data;f) means for computing a track error angle from said lateral deviation rate and said ground speed data; and,g) means for computing runway bearing relative to ground track from said track error angle and said localizer deviation data; andh) means for displaying symbology indicative of said runway bearing relative to ground track on a display screen.