Phase Comparison And Processing Technology Of Time-frequency Signal

The phase comparison and processing between the periodic signals is an importantmethod to solve high-resolution measurement techniques in the measurement andcontrol field. Phase difference between the periodic signals reflects regularity of phasequantization stepping. The regularity shift of phase has a good application anddevelopment prospects in the time-frequency measurement. Frequency and frequencystability measurements, phase difference measurement and phase noise measurementcan be completed by phase difference analysis and research. For the further research,the technology can be used in precision measurement in space for the development ofelectronic devices and effective means of the phase process between the two signals.Temperature and frequency drift is atomic frequency standard inherent characteristicswhich effects atomic frequency standard performance. By the analysis of its temperatureand drift characteristics, the atomic frequency standard performance improvement isstudied though the digital compensation technology. The author’s major contributionsare outlined as follows:1. The phase relationship between arbitrary signals has been studied. The phasecomparison between the arbitrary signals is present. The comparison between multiplefrequencies is equivalent to the same nominal frequency. The smaller the quantizationphase shift resolution, the higher the measurement resolution. The comparision can bedone between the periodic signals without the same or multiple nominal frequencies.Arbitrary signals can be directly compared by introducing the nominal the leastcommon multiple period. The corresponding formula is deduced. The complexfrequency conversion is simplified in the frequency change of the chain.2. High-resolution phase difference measurement technique has been studied. Thispaper put forward that quantization error can be eliminate by using of groupsynchronization to eliminate in any periodic signal phase comparison. High-resolutionphase difference measurement can be realized by adding the common oscillation sourceand comparison between the multiple nominal frequencies based on the QuantizedPhase Shift Resolution，Least Common Multiple Period, and equivalent comparison andso on. The phase difference measurement resolution can reach to10ps by using of groupsynchronization for10MHz frequency source.3. Ultra-high-resolution frequency measurement technique has been study. Phasedifference group synchronization concept is proposed to process arbitrary frequencymeasurement which does not require complex frequency transformation. The high resolution frequency measurement in different nominal frequency is complete by phasecomparison and processing based on the phase difference group synchronous underwithout complex frequency conversion. The measurement resolution can get10-15/sin self-correction and10-13/s in different frequency standard in wide range accordingto the quantization phase shift resolution and frequency synthesis technique.4. High-resolution linear phase comparison has been study. Distance measurementby the linear-phase comparison technology is present. High linearity is ensured bycontrolling the phase comparison region though the single divider controlling phasecomparison and the small multiple frequency relationship. The trigger error can bereduced by plus average method, optimization option of the signal processing circuit.The noise of the source can be reduced by the control of voltmeter integration time andthe measurement of distances can be completed, the resolution can be achieved30μm.5. Phase noise measurement technology has been studied. Phase quantization of theperiod signals is put forward by the phase quantization and phase difference groupsynchronization analysis based on phase comparison equivalent between multiplenominal frequencies and the same nominal frequency. The wide range phase noisemeasurement can be realized by the count gate jitter measurement and effectiveresponse time in the appropriate frequency relation and high accurate capture of phasedifference group synchronization.6. Temperature and drift of the rubidium atomic frequency standard have beenstudied. The compensation program of temperature and drift characteristic in Rbfrequency standard are designed. The temperature and drift are systematic errors,temperature characteristics has certain repetitive, non-real-time compensation oftemperature characteristic can develop the Rb frequency standard; drift discreterelatively larger, digital compensation can be used in more obvious to the regularity ofclock drift.