| 摘要 |
The invention relates to sonar transmission means and in particular to transmission means that enable the implementation of an omnidirectional acoustic transmission. The invention relates to a method for implementing an omnidirectional transmission using a towed linear aerial of length L greater than the wave length of the output signal, constituted by a plurality of P projectors, with the space between projectors being substantially less than /2. The inventive method consists mainly in applying to each projector an output signal emanating from a common output signal, said common signal being assigned a delay expressed in accordance with a law that comprises a non-linear term dependent on the position of the projector in the aerial, the application of said law enabling the sendout chart angular aperture to be modulated. The invention enables in particular the implementation of sonar detection systems that comprise transmitting and receiving aerials of substantially identical diameter which can be wound onto one and the same winch without it being necessary to separate them. |
