基于32位定點dsp的軌道電路信號接收研究

1、北京交通大學碩士學位論文基于32位定點DSP的軌道電路信號接收研究姓名：丁小汀申請學位級別：碩士專業(yè)：交通信息工程及控制指導教師：邱寬民20071201』b塞變通厶堂亟堂位監(jiān)塞△旦塾顯叢3Atpresent16bitfixedpointDSPand32一bitfloatingpointDSPareusuallyusedinreceivingrailwaysignalHowever16bitfixedpointDSPhaspoorcomp

2、utingabilityandlowspeed，and32bitfloatingpointDSPcomprisescomplicatedcircuitswhichresultinhi【ghcostBasedontheZPW2000trackcircuit，thispaperstudiedhowteceiveanddemodulatetherailwaysignalwith32bitfixcdpointDSPTMS320F2812Inth

3、ispaperboththesoftwareandhardwareoftheminimumreceivingsystemagefirstdesignedonthebasisoftheoreticanalysisandsimulation，andthentheperformanceofthesystemistestedandexaminedThemainachievementsofthispaperareasfollows：1Analgo

4、rithmofzoomingspectrumcalledZOOM—F】盯isanalyzedtheoreticallyandsimulatedIthasbeenprovedthatZOOM—FFrcangreatlyimprovethefrequencyresolutionandreducethesamplingratewithoutincreasingsamplingnumbers，andatthesanletimemeetthesa

5、mplingtheoremByfrequencyspectrumsimulationofwindowedZPW2000signal，thehammingwindowandharmwindowareprovedtobeabletoeffectivelysuppresstheinterferenceonspectrumcausedbytruncatedsignalThetwomainproblemsinspectralanalysisare

6、resolved2TheactualeffectofdigitalfiltersandFFranalysisrealizedrespectivelyby32bitfloatingpoint32bit觸cdpointand16bit丘xedpointoperationarecomparedbysimulationAccordinglythecomments∞thecomputingabilityof32bitfixedpointDSPar

7、emadethatthecoefficientquantizationroundingerrorandoverflowof32bitfi]【edpointoperationhavelittleeffectonfiltersandFFranalysiscomparedto32bitfloatingpointoperationandthat32bit血cdpointDSPhasabetterperformancethan16bit6xcdp

8、ointDSE3AccordingtotheexperimentalreportofthesubjectivecabsignalusedontherailwaybetweenDalianandQinhuangdsoandthecalculationofharmoniccurrentofmultipleunitsdonebySiemenstherequirementforantiinterferenceofreceivingtherail

9、waysignalisanalyzedandaninbandSNRof2：1isdeterminedtobetheantiinterferenceindexofsignalreceivers4AccordingtotheminimumshortcircuitcurrentofrailsandtheanaloginputvoltagerangeoftheADconverters∞TMS320F2812thedynamicrangeofth