Novel High-Resolution Phase Difference Measurement Method Based on Group Phase Quantization Processing

A novel high-resolution phase difference measurement method is proposed based on group period phase comparison and group phase quantization processing.By using the distribution law of the group phase coincidences between any frequency signals and establishing measurement gate at the group phase coincidences,the phase difference measurement is converted into the short time interval measurement on the basis of the group period,thus greatly improving the measurement resolution of system.With introducing the common frequency source signal and the group phase quantization processing technique,the randomness of actual counter gate on/off is reduced,and the ±1 counter error in the traditional measurement is eliminated and the measurement resolution of short time interval is improved.Furthermore,the higher the measurement resolution of short time interval is,the higher the measurement resolution of phase difference.Experimental results show that the measurement resolution of the actual phase difference caused by the short time interval measurement resolution with 10-13s can reach 0.0001° by the conversion of time and phase difference under the control of the MCU.It is evident that the method is better than the traditional phase difference method.The novel method has a simple circuit structure and low cost.Therefore,it may be widely used and popularized in time and phase synchronization field.