27897.基于gps的1pps的二級頻標(biāo)馴服技術(shù)

1、西安電子科技大學(xué)碩士學(xué)位論文基于GPS的1PPS的二級頻標(biāo)馴服技術(shù)姓名：孫江濤申請學(xué)位級別：碩士專業(yè)：測試計量技術(shù)及儀器指導(dǎo)教師：周渭20100501AbstraetAbstract1PPS(OnePulsePerSecond)derivedfromGPS(GlobalPositioningSystem)hasexcellentlongtermaverageprecisionandstabilityandsecondclassfrequ

2、encystandardsareofexcellentshort—termstabilityandlow—costTocombinetheadvantagesofbothtogetherthispaperconductsastudyonthelockedtechniqueofsecond—classfrequencystandardswiththe1PPSfromGPSasthefrequencyreferenceInthetechni

3、quementionedabove，thedirectcountingmethodandthetime—amplitudeconveRorarecombinedtomeasuretheshorttimeintervalbetweenthe1PPSfromGPSandthefrequency—divided1PPSfromsecondclassfrequencystandardsThemeasurementresolutionachiev

4、eslOOpswitharangeofseveralsecondsAndthen，aKalmanfilterisusedtoprocessthemeasurementdatatoeliminatetheeffectsofthephasejittercontainedinthe1PPSfromGPSonthelockprocessAfterthefiltering，thefrequencycorrectioniscalculatedbyu

5、singaPIDcontrollerandthenitisoutputthroughahighresolutionDACconvertorandpropersignalconditioningcircuitstocarryouttheaccuratelockofsecond—classfrequencystandardsAtthesametime，asimplemeasurefortimesynchronizationistakenbe

6、tweenthefrequencydivided1PPSfromsecondclassfrequencystandardsandthe1PPSfromGPS，whichmakesthetimeerrorbetweenbothwithincertainrange(10ns)Atlast，thispaperexploresthetechniquewhichcancorrectthefrequencyerrorsofsecondclassfr

7、equencystandardsandmaintainitslockprecisionwhenthe1PPSfromGPSbecomesinvalidBasedonthetechniqueabove，thispaperdesignsaprototypeofthelocksystem，presentsthedesignschemeofhardwareandsoftwareofthesystem，anddoessometestsonthel

8、ockperformanceofthesystemThetestresultsshowthattheVCOCXOlockedbyusingthistechniquemaintainsitsoriginalshort—termstabilityanditslong—termstabilityandaverageprecisionaleimprovedtosomeextentKeyword：secondclassfrequencystand