Method and apparatus for interpretation of sonar signals

Details Method and apparatus for interpretation of sonar signals Method and apparatus for interpretation of sonar signals

1965-09-28

1996-06-11

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Receiver circuitry

367901, G01S 1500

Patent

active

055263232

ABSTRACT:
In the particular embodiment of the invention described herein, sonar signals in the range from 200-3600 cps. are analyzed by bandshifting selected segments of 100 cps. width to the range 300-400 cps. for analysis, and indications of signals in all of the bands are presented side-by-side on a continuous printer. in addition, the modulation envelope of the detected signal, which contains low frequency modulation components, is demodulated to provide indications of such low frequency components in a target signal.

REFERENCES:
patent: 2368953 (1945-02-01), Walsh
patent: 2487135 (1949-11-01), Herrnfeld
patent: 3054053 (1962-09-01), Cook
Bennett, Proc. of the IRE, vol. 36, pp. 906-907 Jun. 1948.
Cron et al., J. of the Acous. Soc. of America, vol. 37 Mar. 1965.

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