Two-signal extension of an adaptive notch filter for frequency tracking

Adaptive frequency tracking is useful in a broad range of applications, and many schemes have been introduced in the recent years for that purpose. Starting from the observation that, in some situations, the sinusoidal component to be tracked is present in more than one signal, we propose in this paper to extend frequency tracking to two signals in order to improve convergence properties. We apply this idea to a specific adaptive frequency tracking algorithm and obtain through theoretical analysis and computer simulations the performance gain of this new scheme for the tracking algorithm considered.