Accession Number:

AD0757013

Title:

The Action of Dither in Digital Matched Filters.

Descriptive Note:

Final rept. on phase 1,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s):

Report Date:

1973-02-01

Pagination or Media Count:

26.0

Abstract:

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

Subject Categories:

  • Electrical and Electronic Equipment
  • Countermeasures

Distribution Statement:

APPROVED FOR PUBLIC RELEASE