1、湖南大學(xué)碩士學(xué)位論文基于FPGA的多通道時(shí)頻比對(duì)系統(tǒng)研究姓名：季育文申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：生物醫(yī)學(xué)工程指導(dǎo)教師：肖昌炎20090420碩Jj學(xué)位論文AbstractTimeisoneofthemostimportantphysicalquantitiesThevaluecomparisonamongvariousstandardtimesignalinthesameaccuracycircumstances，whichisalsona

2、medthecomparisonoftime—frequency，hasalsobeenthefocusofscientificresearchWiththerapiddevelopmentofelectronictechnologyandthecontinuousinnovationofhigh—precisiontimeintervalmeasurementmethod，aswellastheimportanceofhighprec

3、isiontimestandardshasbeenconstantlyimprovedinthenationallife，scientificresearchactivitiesandnationaldefenseengineering，theresearchaboutthecomparisonsystemoftimefrequencyhasbecomeahottopicinthefieldofelectronicsandmeasure

4、mentathomeandabroadTimeintervalmeasurementiSthecoreinthecomparationsystemoftimefrequencyThispaperfirstlyintroducedsomekindsoftimeintervalmeasurementmethods，andclassifilycomparedtheirmerit，weaknesseandpracticalityAfterana

5、nlyzingthetestingindicatoroftimeperformanceintheBD／GPSdual—modeinterstationsynchronizationsystems，thereprensentaquantitativemethodofthedelaytimeintervalmeasurementbasedonDCM(DigitalClockManager)Atthesametime，thispaperdes

6、ignedthemultichanneltimefrequencycomparationsystembasedonFPGA(FieldProgrammableGateArray)，makingfulluseoftheresourcesadvantageofthelargescaleprogrammablelogicdevices，suchasingeneralhardware，inprogrammingflexibilityandIPc

7、oreItpresentthesystemdesigneddiagram，andusedtheEDAmethodtopragramanddesignthetimeintervalmeasurementmodule，theanalysismodule，themultichannelserialcommunicationandthefrequencycalibrationmodules，verifiedandtimlysimulatetho

8、semodules，aswellascompletedallthedesignandproductionofthehardwarecircuitmodules，includingpowermodules，RS232interfacecircuit，RS485interfacecircuit，frequencycalibrationcircuit，JTAGdebuginterfacecircuitMeanwhile，usingthemat

9、uredvirtualinstrumenttechnology，itachievedmanyfunctions，suchassynchronouscommunication，massdatastorage，realtimedynamicdataandimagedisplay，overrunalarmThroughtheonlinedebuggingofthesystemandexperimentaldata，theanalysissho

10、wedthat，themulti—channelcomparationsystemoftime—frequencydesignedinthispaper，whosemeasurementaccuracyreach167nsinthehigh—stabilityconditionsof10Mclockinput，isalmost20timesthanthatoftheaccuracyofelectroniccounting，atthesa