To improve precision of phase difference estimation for Coriolis mass flowmeter（CMF） signals

a phase and frequency matching method based on phase difference estimation for time-varying signals is proposed.The estimated phase difference is obtained by means of frequency matching between time-varying signals and reference signals

phase matching between phase-shift signals of time-varying signals and their quadrature component

cross cross-correlation among reference signals

time-varying signals and its quadrature component. The results of calculation verification demonstrate that the proposed method completes 90° phase shift of time-varying signals exactly and improves estimation precision of phase difference for time-varying signals effectively.Measurement experimental results of CMF validate the effectiveness and superior of the proposed method.