| 摘要 |
The present invention is directed to a bird collision avoidance system, wherein the bird collision avoidance system is installed on an aircraft and comprises a bird detection unit and an associated bird repelling unit, wherein, the bird repelling unit comprises at least one soudn emitter to generate a sound signal having a variable frequency, focussed beam pattern which is directed along a project flight path of an aircraft. The advantage of using sound signal having a focussed beam pattern is that the beam can be focussed substantially directly at a bird in the projected flight path of the aircraft and can be used to repel the bird away from the projected flight path of the aircraft. By focussing the beam only at the bird in the projected flight path of the aircraft, other birds in the vicinity but not in the projected flight path of the aircraft will not hear the sound signal, and, therefore habituation to the sound signal will be slower than with omni-directional noise emitters as known from the prior art. A modulated ultrasound signal signal may be used as the sound signal having a focussed beam pattern. The bird collision avoidance system may also be mounted on wind turbines. |
