Abstract
The objective of this work is to know, in the context of submarine detection, what is the effect of a linear frequency modulation on the detection of glissando’s signals. Indeed, this frequency modulation is often present in submarine signals, whether of biological or mechanical origin. Different types of glissandos are considered, increasing, increasing–decreasing, increasing with plateau, and decreasing. Differences have not been noted between the detection thresholds for the first three types of signals. In general, the detection threshold is very close to the maximum frequency of the signals threshold. In the case of a decreasing glissando, it can be noticed that the detection threshold is lower by a few dB than the threshold of the signal’s highest frequency.
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