发明名称 |
INTERFERENCE SUPPRESSION UNIT FOR A SONAR APPARATUS |
摘要 |
<p>: Sonar apparatus provided with a beamforming network (1) containing several receiving channels (4A-M) for supplying, for each direction of beam incidence 9 digital composite signal products obtained by superposition of the receiving channel output signals and for transforming the signal products to a low-frequency band. The signal products are fed to a signal analysing circuit (3) comprising blocking circuits (62 and 63), and to a noise detector (61) for deriving, for each direction of beam incidence, a blocking circuit control voltage from the interference signal components in the signal products. The noise detector thereto selects signals outside the low-frequency band part representing the transmitting/receiving band, and determines the modulus of the filtered signals and the average value thereof. The modulus and, after thresholding, the average value are fed to a comparator (77) to generate the control voltage.</p> |
申请公布号 |
CA1203613(A) |
申请公布日期 |
1986.04.22 |
申请号 |
CA19830421472 |
申请日期 |
1983.02.11 |
申请人 |
HOLLANDSE SIGNAALAPPARATEN B.V. |
发明人 |
LANGERAAR, HUIBERT B.;VAN DER SCHOOT, ALEXANDER P.M. |
分类号 |
G01S7/527;G01S7/536;G01S15/06;G01S15/42;G10K11/34;(IPC1-7):G01S7/52;G01S7/66 |
主分类号 |
G01S7/527 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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