Arbitrary Frequency Measurement Research Based On Phase Group Synchronization

Most frequency measurement instruments have±1count error. Methods toimprove the resolution have not effectively eliminated this error, such as the analoginterpolation, the cursor, and the time-digital conversion method.This thesis presents an arbitrary frequency measurement method based on phasegroup synchronization concept and precision phase move to constitute a measure gate. Itcan realize a high-resolution and rapid measurement of arbitrary frequency signals,remove the frequency conversion circuit, and reduce the system noise. The cost of thisequipment is far less than the current commercial high-precision instruments. Based ona phase group synchronization concept, the method by using phase coincidencedetection between the reference signal and measured frequency signal to build ameasure gate can eliminate the±1count error existing in common count measurementmethods, and then it can obtain very high measurement resolution. Further more, itsolves the problem of response time in any frequency signals measurement by precisionphase move to constitute a measure gate. Experimental results show that the resolutionof this method with a wide frequency measurement range can achieve5×10^-11/s,which can meet the needs of low-cost and wide range applications.This method is not relying solely on circuit improvement and algorithmoptimization to improve the measurement resolution. However, it uses the naturalchange law of the phase between periodic frequency signals to realize direct phasecomparison and high resolution measurement between any frequency signals. By theconcept of phase group synchronization, it can realize the direct measurement of thetime and frequency related parameter between any frequency signals, such as frequency,phase difference, phase noise and so on, which has universal significances.