Movement of a structure, such a conduit of a Coriolis mass flowmeter, is
estimated. A plurality of motion signals representing motion of the
structure are mode selective filtered to generate a plurality of mode
selective filtered motion signals such that the mode selective filtered
motion signals preferentially represent motion associated with a
vibrational mode of the structure. A plurality of phase estimates is
generated from the plurality of mode selective filtered motion signals.
The plurality of phase estimates may be generated using a phase reference
derived from a mode selective filtered motion signal of the plurality of
mode selective filtered motion signals. According to some embodiments, a
frequency of a mode selective filtered motion signal is estimated, and
quadrature first and second reference signals are generated based on the
estimated frequency. The plurality of phase estimates is generated from
the mode selective filtered motion signals and the reference signals.
