The Effect of Signal Incidence on Detectability.
Abstract
An experimental determination of probability of detection P(D) as a function of signal incidence, SI (how often a signal occurs) showed that: P(D) decreases linearly as the SI is reduced; and P(D) remains finite as SI approaches zero. To conduct the tests, observers were shown projections of film strip photographs of the output of TRACOR's 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 S/N, P(D) 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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 16, 1968
- Accession Number
- ADA071770
Entities
People
- J. M. Young
Organizations
- Tracor