Abstract
A study was carried out in the laboratory to determine the detectability of visual sonar targets as a function of retinal position and brightness contrast using a simulated sonar scope. Nine different retinal positions were investigated under photopic conditions of illumination. The target was approximately square and subtended 24 minutes of visual arc on a side. Average peak intensity of the sweep, which formed the target background was 9.12 FL. The results of the study were presented in terms of probability of detection curves. Equations were developed for determining the probability of detection given the target's normalized brightness intensity, expressed in Log ΔI/I, and its angular distance from the point of fixation.
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