The present disclosure is directed to spectral analysis of a position
error signal. In a particular embodiment, the method includes analyzing a
spectral content of a position error signal. The method also includes
comparing the spectral content to a threshold. Further, the method
includes determining a result based on the comparing the spectral content
to the threshold. In another particular embodiment, the spectral content
of the position error signal is determined by performing a discrete
fourier transform (DFT) on the error signal, determining a magnitude of
the DFT output, and low pass filtering the magnitude.