  Micro and nanomechanical resonators have been extensively researched in
recent decades for applications to time and frequency references, as well as
highly sensitive sensors. Conventionally, the operation of these resonant
sensors is practically implemented using a feedback oscillator to dynamically
track variations in the resonant frequency. However, this approach places
limitations on the frequency stability of the output response, particularly
owing to near-carrier phase noise, potentially limiting measurements over long
integration times. Here, in this paper, utilizing the recent experimental
demonstration of phononic frequency combs, we demonstrate an alternative
resonant tracking approach with the potential to provide significant
improvements in near-carrier phase noise and long-term stability. In addition,
we also showcase comb dynamics mediated resonant frequency modulation which
indirectly points to the possible control of inevitable noise processes
including thermomechanical fluctuations. This resonant tracking approach may
also have general applicability to a number of other physical oscillators.
