Extending coherence for optimal detection of nonstationary harmonic signals

This paper describes an improved detector for nonstationary harmonic signals. The performance improvement is accomplished by using a novel method for extending the coherence time of such signals. This method applies a transformation to a noisy signal that attempts to fit a simple model to the signal's slowly changing fundamental frequency over the analysis duration. By matching the change in the signal's fundamental frequency, analysis is more coherent with the signal over longer durations, which allows the use of longer windows and thus improves detection performance.

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