Switching procedure and device for an aircraft...

B - Operations – Transporting – 64 – D

Patent

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Details

B64D 45/04 (2006.01) G01S 1/04 (2006.01) G01S 1/56 (2006.01)

Patent

CA 2460606

The method allows switchover between a first input (5) of a radiofrequency receiver (4) of the radiofrequency landing system (1), which input is connected to a first antenna (2) disposed on a lower part of the aircraft and receives a first signal, and a second input (6) of the radiofrequency receiver (4), which input is connected to a second antenna (3) disposed on an upper part of the aircraft. On initialization, switchover occurs to the input (5, 6) whose signal exhibits the highest level, and, after the initialization phase, a first value of a parameter, in relation to the aircraft, and a second value of this same parameter, in relation to the runway, is determined, the difference between these first and second values is computed, and switchover occurs to one of the first and second inputs (5, 6), as a function of this difference, and, moreover, one hysteresis loop around the switching values is provided.

Le procédé permet la commutation entre une première entrée (5) d'un récepteur radiofréquence (4) du système d'atterrissage radiofréquence (1), qui est reliée à une première antenne (2) agencée sur une partie inférieure de l'aéronef, et une seconde entrée (6) du récepteur radiofréquence (4), qui est reliée à une seconde antenne (3) agencée sur une partie supérieure de l'aéronef. A l'initialisation, on commute sur l'entrée (5, 6) dont le signal présente le niveau le plus élevé, et après la phase d'initialisation, on détermine une première valeur d'un paramètre, relativement à l'aéronef, et une seconde valeur de ce même paramètre, relativement à la piste, on calcule la différence entre ces première et seconde valeurs, et on commute sur l'une des première et seconde entrées (5, 6), en fonction de cette différence, et de plus, on prévoit au moins une boucle d'hystérésis autour des valeurs de commutation.

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