| 摘要 |
A method of obtaining an acoustic echo signal by a sonar apparatus (receiver array 100, 101). 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; 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.
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