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==Background==
Analysis of the loads on a [[wind turbine]] can be carried out through use of power spectra. A power spectrum is defined as the power spectral density function of a signal plotted against frequency. The power spectral density function of a plot is defined as the [[Fourier transform]] of the covariance function.<ref>Remote sensing: models and methods for image processing, R. a. Schowengerdt</ref><ref>Remote Sensing: Models and Methods for Image Processing, Robert A. Schowengerd</ref> Regarding analysis of loads, the analysis involves time series, in which case the covariance function becomes the [[autocovariance]] function. In the signal processing sense, the autocovariance can be related to the [[autocorrelation]] function.
==Deterministic processes==
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