Sonar transceiver system and method

Details Sonar transceiver system and method Sonar transceiver system and method

1982-02-05

1984-04-10

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

343 14, 364728, 367101, G01S 1514, G01S 766

Patent

active

044425139

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.

REFERENCES:
patent: 3363248 (1968-01-01), Nicodemus
patent: 3887918 (1975-06-01), Bailey, Jr. et al.
patent: 4199246 (1980-04-01), Muggli
patent: 4255795 (1981-03-01), Hechtenberg
patent: 4287528 (1981-09-01), Heyser
patent: 4404665 (1983-09-01), van Heyningen

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