| 摘要 |
<p>The invention concerns sonars enabling the characteristics of undersea mines to be determined.
<??>It involves modifying the transmission pattern in the vertical plane of such a sonar so as to obtain two main lobes (44, 45) separated by a central zero. On reception, the system displaying the bearing and frequency has a dark band (62) separated by two bright bands (61, 63). When the echo from a mine (71) persists when passing across the dark zone, it is recognised that there is a moored mine floating under water.
<??>This enables moored mines to be located and their depth of submersion to be measured.
<IMAGE>
</p> |
