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The aim of this work was to obain detailed measurements of the behaviour of the time dependence of the detection threshold of a frequency-time-intensity sonar display. The theoretical expression was found to hold true for a computer algorithm designed to mimic an ‘ideal’ observer, but trained human observers consistently showed a systematic loss which increased with the length of time history. The empirical correction to the detection threshold for human observers is given, along with a hypothesis to explain the performance loss.

On The Dependence Of Detection Threshold On Integration Time For Frequency-time-intensity Sonar Displays