Surface Acoustic Signal Defader.
DEPARTMENT OF THE NAVY WASHINGTON DC
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A surface acoustic signal defader for optimizing the signal received from underwater sound scattered from the ocean surface. The bandwidth of the underwater sound source is monitored and the frequency of 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.
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