A generalized frequency processor
J. W. Young · The Journal of the Acoustical Society of America · 1979
The signal received by a Doppler navigation sonar (or radar) has the character of narrow bandwidth noise [F. B. Berger, IRE Trans. Aero. Nay. Elec. ANE-4, 103 (1957)]. The desired information is some characteristic of the spectrum of this process such as the center of power or a higher order moment. A variety of hardware implementations of frequency measurements systems have been used for this purpose, but their relationship to spectral analysis has remained somewhat obscure. In this paper, it is shown using the analytic signal concept that a “frequency discriminator” computes the first moment of the power spectrum. The approach is generalized to develop a signal processing architecture which can compute an arbitrary function of the power spectrum.