Title:
SONAR DEVICE
Document Type and Number:
Japanese Patent JPS58179370
Kind Code:
A
Abstract:
Sonar apparatus provided with a beamforming network (1) containing several receiving channels (4A-M) for supplying, for each direction of beam incidence, 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 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.
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Inventors:
HIYUIBERUTO BARENDO RANGERAARU
AREKUSANDAA PETERU MARIA FUAN
AREKUSANDAA PETERU MARIA FUAN
Application Number:
JP2865383A
Publication Date:
October 20, 1983
Filing Date:
February 24, 1983
Export Citation:
Assignee:
HOLLANDSE SIGNAALAPPARATEN BV
International Classes:
G01S7/527; G01S7/536; G01S15/06; G01S15/42; G10K11/34; (IPC1-7): G01S7/66; G01S15/06
Domestic Patent References:
| JPS55154485U | 1980-11-07 | |||
| JPS47849A | ||||
| JPS5722576A | 1982-02-05 | |||
| JPS54138000A | 1979-10-26 | |||
| JPS55105171U | 1980-07-22 | |||
| JPS5121852A | 1976-02-21 |
Attorney, Agent or Firm:
Akihide Sugimura