| 摘要 |
The collision avoidance aids for an aircraft (T-CAS) provide on the ground at least one radar (1), called a secondary monitoring radar, emitting synchronised information on the one hand in the form of directional waves with angular scanning, on the other hand in the form of omnidirectional waves. The two aircraft (A, I) are equipped with an active responder, reacting to the reception of directional waves from the radar and returning identity and altitude information, also in the form of omnidirectional waves, as well as a receiver of the waves received from the radar and from the responders, and processing means intended to provide information on the relative position of the two aircraft. The radar is accompanied by a beacon (B) stationary on the ground, itself also fitted with a responder, but returning information specific to this beacon, such as its bearing and its distance. An aircraft (A) thus equipped first determines it distance from the radar on the basis of the radar/beacon segment, defined by the response information of the beacon, then its distance from the other aircraft, called the "intruder", on the basis of the radar/aircraft segment. <IMAGE> |
