| 摘要 |
<p>A method of obtaining an acoustic echo signal by a sonar apparatus (100). The method comprises measuring phases and magnitudes of at least one predetermined acoustic calibration signal received from a plurality of respective directions (109) by the sonar apparatus (100); determining a complex directional response from the measured phases and magnitudes; receiving an acoustic echo signal; compensating the received acoustic echo signal for the determined complex directional response.</p> |
