Bayesian Spectrum and Chirp Analysis

We seek optimal methods of estimating power spectrum and chirp (frequency change) rate for the case that one has incomplete noisy data on values y(t) of a time series. The Schuster periodogram turns out to be a “sufficient statistic” for the spectrum, a generalization playing the same role for chirped signals. However, the optimal processing is not a linear filtering operation like the Blackman-Tukey smoothing of the periodogram, but rather a nonlinear operation. While suppressing noise/side lobe artifacts, it achieves the same kind of improved resolution that the Burg method did for noiseless data.

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