Accession Number:

ADA218261

Title:

Operating Characteristics for Combiner with a Dead Zone in Each Channel

Descriptive Note:

Technical rept.

Corporate Author:

NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CT

Personal Author(s):

Report Date:

1989-08-10

Pagination or Media Count:

68.0

Abstract:

Some data processing shortcuts are often required in order to keep the computational burden in todays detection and tracking systems within manageable limits. Here, we investigate a technique, where all levels below a breakpoint or threshold value are rejected, that is, set to zero, while those signal levels above the breakpoint are retained in their full accuracy. The receiver operating characteristics, namely detection probability versus false alarm probability, for a combiner which employs nonlinearities with dead zones in each of its channels, are derived in closed form, as a function of N, the number of channels F, the fraction of data passed by the nonlinearity in each channel R, the signal-to-noise ratio in each channel and T, the system output threshold. Plots of these results for N 1, 2, 4, 6, 8, 16, 32, 64 and F 1, . 1, .01, .001 reveal that inclusion of the dead zone does not significantly degrade performance, the typical loss being of the order of 1 dB for small N, and 3 dB for larger N, in the important operating ranges. The only limitation is that certain ranges of false alarm probabilities are achievable however, since these ranges generally correspond to undesirable operating conditions, the limitation is not too relevant. Keywords Matched filters, Breakpoint of threshold.

Subject Categories:

  • Miscellaneous Detection and Detectors
  • Target Direction, Range and Position Finding

Distribution Statement:

APPROVED FOR PUBLIC RELEASE