The Research Of Processing And Measurement Technology On Phase Difference And Group Phase Difference For High-precision Time-frequency Signal

The improvement of precision and the simplification of device is the direction ofdevelopment in measurement, comparison, and frequency of control and conversion.Because measurement, comparison, and control of time-frequency signal are built onthe basis of mutual relations, it is necessary to obtain high-precision contents ofcharacteristics from the beginning of mutual relationships between frequency signals.Further research on periodic time-frequency signal of the phase relationship can help ushave a deeper understanding of two periodic signals phase difference. Any phasedifference of two periodic signals had no regular change on surface. However, in theleast common multiple period, if these phase differences are arranged from the small tothe big or from the big to the small, they will appear an obvious regular change. In thispaper, some new ideas based on above of the phase relationship, such as group phasedifference, group phase coincidences, greatest common factor, the least commonmultiple period and equivalent phase comparison frequency are presented and applied tothe processing of time-frequency signals. Compared with traditional processingapproaches, this application can make the circuit simpler and measurement resolutionhigher.In this article, when applying these new concepts and theories to the group phasedifference and phase difference measurement, higher accuracy can be achieved inmeasurement. As two standard frequency signals which have complex phaserelationship, a kind of ultra-high-resolution phase measurement method based on groupphase relationship is proposed in this paper. By introducing appropriate public sourcesignal, the method make the actual count gate of the opening and closing signal keepsynchronization with the public source signal, thus avoiding the traditionalmeasurement methods of count error, simplifying the circuit design and reducing designcost, and largely improving the measurement accuracy.