Aircraft terrain warning systems and methods
View Patent ↗Methods and systems are disclosed for preventing aircraft collisions with forward looking terrain avoidance (FLTA) functionality based on a terrain avoidance profile used to evaluate potential terrain threats based on the projected flight path of an aircraft in flight, and a clear terrain profile to determine whether the terrain threat has been cleared. If the terrain avoidance profile conflicts with terrain, a collision threat may exist whereby the pilot is notified and a terrain avoidance maneuver is executed. During the terrain avoidance maneuver the clear terrain profile extends in a direction substantially parallel with the horizon at or near the present altitude of the aircraft to check whether it is safe to return to the previous flight path angle or otherwise end the terrain-avoiding maneuver. When the clear terrain profile no longer conflicts with the terrain threat, a terrain clear indicator is then issued to the pilot.
1. A computer program product for preventing controlled flight of an aircraft into terrain, the computer program product stored in a tangible medium and comprising machine-readable code for:
comparing a terrain avoidance profile with terrain information to determine whether a potential collision threat with terrain exists;
generating a warning alert signal if the potential collision threat with terrain does exist;
comparing a clear terrain profile with said terrain information to determine whether to end a terrain avoiding flight maneuver; and
generating a terrain clear signal if it is determined that the terrain avoiding flight maneuver is to be ended;
wherein the clear terrain profile comprises a horizontal projection of the aircraft in a direction of the aircraft before a terrain avoiding maneuver is executed.
2. The computer program product of claim 1 further including code for:
monitoring air traffic in an area proximate to the aircraft to determine whether a potential traffic collision threat exists; and
generating at least one of a traffic advisory or a resolution advisory when the potential traffic collision threat is determined to exist.
3. A computer program product for preventing controlled flight of an aircraft into terrain, the computer program product stored in a tangible medium and comprising machine-readable code for:
comparing a terrain avoidance profile with terrain information to determine whether a potential collision threat with terrain exists;
generating a warning alert signal if the potential collision threat with terrain does exist;
comparing a clear terrain profile with said terrain information to determine whether to end a terrain avoiding flight maneuver; and
generating a terrain clear signal if it is determined that the terrain avoiding flight maneuver is to be ended;
wherein the clear terrain profile comprises an algorithm that when processed identifies a projected area in a direction substantially parallel with the horizon and in front of the aircraft's bearing.
4. The computer program product of claim 3 further including code for:
monitoring air traffic in an area proximate to the aircraft to determine whether a potential traffic collision threat exists; and
generating at least one of a traffic advisory or a resolution advisory when the potential traffic collision threat is determined to exist.