Abstract
A common receiver structure for the detection of sinusoidal signals obscured by a noise background is the filter, square, and integrate processor. For this processor, an interpretation of postdetection integration gain is given in terms of a low-pass filtering of the noise power time series. Although a processing gain of 1.5 dB per integration interval doubling is predicted, subsequent analysis on the highly colored envelope spectrum of ambient ocean acoustic noise data in the kilohertz region shows that its nonstationarity significantly alters realizable processing gains for integration intervals of tens to hundreds of seconds.
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