A horizontal miss distance filter system for suppressing...

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G01S 13/93 (2006.01) G05D 1/08 (2006.01) G01S 13/70 (2006.01) G01S 13/74 (2006.01)

Patent

CA 2201760

A horizontal miss distance filter system (220) is provided for inhibiting resolution alert messages from an air traffic alert and collision avoidance system (210) to a pilot's display (230). The horizontal miss distance filter employs a parabolic range tracker (10) to derive a range acceleration estimate (11) utilized to discriminate intruder aircraft (110) having non-zero horizontal miss distances. The horizontal miss distance calculated from the range data provided by the parabolic range tracker is compared with a bearing based horizontal miss distance provided by a bearing based tracker (22). The smaller of the two calculated horizontal miss distances defines a projected horizontal miss distance which is compared with a threshold value. Any resolution alert for intruder aircraft whose projected horizontal miss distance is greater than the threshold will be inhibited unless it is determined that the encounter involves a maneuver of one of the aircraft. As many as five maneuver detectors (50, 52, 56, 58 and 64) may be employed to assess whether the encounter involves a maneuver. If any of the maneuver detectors establish the occurrence of a maneuver, then a resolution alert provided from the TCAS system (210) will not be inhibited.

L'invention concerne un système de filtrage d'écart au sol horizontal (220) servant à inhiber les messages d'alerte de résolution provenant d'un système de prévention de collision et d'alerte de trafic aérien (210) affichés sur l'écran du pilote (230). Ce filtre d'écart au sol horizontal met en application un dispositif parabolique de poursuite de distance (10) afin de calculer une estimation d'accélération de distance (11) servant à distinguer l'appareil intrus (110), dont les écarts au sol horizontaux ne sont pas égal à zéro. L'écart au sol horizontal calculé à partir des données de distance fournies par le dispositif parabolique de poursuite est comparé à un écart au sol horizontal en fonction du relèvement fourni par le dispositif de poursuite à base de relèvement (22). Le plus petit des deux écarts au sol horizontaux calculés définit un écart au sol horizontal projeté comparé à une valeur seuil. Toute alerte de résolution concernant un appareil intrus, dont l'écart au sol horizontal projeté est supérieur au seuil, sera inhibée, sauf s'il est déterminé que la rencontre implique une manoeuvre de l'un des appareils.

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