| 摘要 |
<p>The device has two sonar emitters (23, 25), and a sonar receiver (29) with its reception band adapted to emission frequency of the emitters. A signal processing unit permits to determine position of a floating or submerged object (27) from echoes returned by the object. The processing unit utilizes Doppler differences existing between reflected signals corresponding to same echo and consecutive to emission from each emitter. An independent claim is also included for an application of a submerged or floating obstacle avoiding device to a multi-hulled ship.</p> |
