The Action of Dither in Digital Matched Filters.
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NAVAL RESEARCH LAB WASHINGTON D C
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An analysis was made of how dither, a large suitably fluctuating component added to the input of a digital matched filter digital correlator, eliminates capture of a weak signal by an unwanted signal. The signal-to-noise ratio of various correlators with two specific dithers in certain specific jamming environments was analyzed. The correlators analyzed, in comparison with a classical ideal correlator, were a polarity coincidence detector without dither, a polarity coincidence detector with dither of random amplitude uniformly distributed between the chosen plus-and-minus peak values, and a polarity coincidence detector with CW dither, each being analyzed for the cases of Gaussian noise, rectangular-pulse, and CW interference. The choice of dither amplitude based on the measured value of the noise power was studied. In general a uniformly distributed dither was found to be superior to a CW dither. Author
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