Surface acoustic signal defader

Details Surface acoustic signal defader Surface acoustic signal defader

1978-12-08

1980-08-26

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Underwater system

367 97, 367135, 367901, H04B 110, H04B 1100

Patent

active

042198887

ABSTRACT:
A surface acoustic signal defader for optimizing the signal received from derwater sound scattered from the ocean surface. The bandwidth of the underwater sound source is monitored and the frequency of maximum signal strength is identified. When the maximum signal strength frequency fades a predetermined amount, reception is switched to the signal of maximum anti-correlation. This process is continuous such that when the new frequency fades the anti-correlation process will determine the optimum frequency for the new fading condition, thus resulting in optimum reception of surface scattered underwater sound.

REFERENCES:
patent: 3202968 (1965-08-01), Eady, Jr. et al.
patent: 3392336 (1968-07-01), Schroeder

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