Title:
SONAR-TRANSCEIVER DEVICE AND METHOD OF PROCESSING SONAR SIGNAL
Document Type and Number:
Japanese Patent JPS58146875
Kind Code:
A
Abstract:
A sonar transceiver system and method includes an oscillator and programmable divider which are arranged to cause a transmitting transducer to transmit a plurality of four consecutive closely spaced tones in the manner of a pseudo-chirp. The receiver includes hard limiting means for converting received echo signals to binary signals and tone correlation and detection means including a shift register which compares samples of the binary received signal with a sample of a sine wave as hard limited which is carried on a storage register. A series of exclusive-OR comparator circuits effect the comparison and produce output signals of a desired magnitude when correlations are found. Switching means responsive to detection of the first of the transmitted tones causes the programming means to vary the divisors of the programmable divider to produce clock pulses of varying frequency to the shift register for the time and in the order of the transmitted tones.
Inventors:
RONARUDO KURAARENSU MIIDO
Application Number:
JP1728883A
Publication Date:
September 01, 1983
Filing Date:
February 04, 1983
Export Citation:
Assignee:
BENDIX CORP
International Classes:
G01S7/527; G01S7/536; G01S15/10; G01S15/32; (IPC1-7): G01S7/66
Attorney, Agent or Firm:
Masaki Yamakawa