| 摘要 |
<p>The invention concerns a sonar for avoiding sub-surface underwater objects. It is intended for installation in a surface vessel and its directivity in the angle of elevation or depression is optimized in order to scan the surface. In addition, surface reverberation is minimized.
<??>The sonar uses an acoustic antenna (10) consisting of two columns of n transducers. On transmission, the first column sends acoustic signals over a sector of the angle of elevation or depression which corresponds to the region where there is a risk of collision. On reception, channels (F1 to Fk) are formed in the sector of the angle of elevation or depression over which acoustic signals have been transmitted, the channel widths being smaller the greater the desired precision in measuring the position in elevation. The second column of transducers is needed for location in relative bearing.
<??>Application to the precise measurement of the angle of elevation or depression of objects situated in the path of a ship.
<IMAGE></p> |
