| 摘要 |
A method for achieving omnidirectional transmission using of a towed linear antenna of length L greater than the wavelength lambda of the signal transmitted. The antenna has a plurality of P projectors. The spacing between projectors is substantially less than lambda/2. The method includes applying, to each projector, a transmit signal coming from a common transmit signal. The common signal is assigned a delay based upon a calculation that includes a non-linear term as a function of the position of the projector in the antenna, thereby allowing the angular aperture of the transmission pattern to be modulated. the method permits sonar detection systems comprising transmit and receive antennas having substantially identical diameters, which thereby can be reeled onto the same winch without it being necessary to separate them.
|
