Accession Number:

ADA071770

Title:

The Effect of Signal Incidence on Detectability.

Descriptive Note:

Technical memo.,

Corporate Author:

TRACOR INC AUSTIN TEX

Personal Author(s):

Report Date:

1968-04-16

Pagination or Media Count:

29.0

Abstract:

An experimental determination of probability of detection PD as a function of signal incidence, SI how often a signal occurs showed that PD decreases linearly as the SI is reduced and PD remains finite as SI approaches zero. To conduct the tests, observers were shown projections of film strip photographs of the output of TRACORs digital sonar simulator. Signals were injected in 10, 5, 1 or 0.1 of the frames noise alone was presented in the other frames. At a constant signal-to-noise ratio SN, PD decreased linearly from 0.82 at 10 SI to 0.48 at 0.1 SI, at a constant false alarm probability of 0.01. The decrease in the detectability index d over this span of SI was from 3.21 to 2.28. Author

Subject Categories:

  • Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE