雷電探測(cè)系統(tǒng)信號(hào)預(yù)處理與定位方法研究.pdf

1、華中科技大學(xué)碩士學(xué)位論文雷電探測(cè)系統(tǒng)信號(hào)預(yù)處理與定位方法研究姓名：賀沖申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：電磁場(chǎng)與微波技術(shù)指導(dǎo)教師：馬洪20090525華中科技大學(xué)碩士學(xué)位論文華中科技大學(xué)碩士學(xué)位論文IIAbstractThelightningdetectionsystemplaysakeyroleinthefecastprecautionoflightningdisaster.Howeversystematiclightningdetecting

2、systemshavebeenmonopolizedbyafewdevelopedcountriessuchasAmericaFrance.ThisthesishasstudiedthesignalprocessingflowthepositionlocationmethodusedfVHFcloudtocloudlightningdetectionsystem.Thesignalpreprocessingflowimplementat

3、ionmethodoflightningdetectionsystembasedFPGAplatfmhasbeenputfwardwiththehelpofSoftwareDefinedRadio(SDR).TheinfluenceofestimationerrsofTDOADOAonpositionlocationaccuracyhasbeenstudiedthenthedatafusionmethodthatcanpromotepo

4、sitionlocationperfmancehasbeenbroughtfward.Atlasttheinfluenceofdistributionofobservationstationonpositionlocationperfmancehasbeendiscussed.TheVHFlightningdetectionsystemisbaseduponthearraysignalprocessingplatfm.Themultic

5、hannelsignalsreceivedbyantennasfmintohighspeedbitstreamsthroughhighspeedADC(AnalogtoDigitalConverter).Theprocedureofdatapreprocessingincludesthedetectionofwhetherthereisalightningboltthedigitaldownconverter(DDC)ofhighspe

6、edmultichannelsignalsthefmofautocrectionmatrixinFPGAs.ThisthesishasdesignedthelightningdetectionmodulebasedonpowerdetectioninFPGAinwhichthemethodofsettingoptimizedthresholdisintroducedtoreducethesumoffalsealarmprobabilit

7、yleakagealarmprobability.Thenthedigitaldownconverterbasedonthethinkingofsoftwaredefinedradiohasbeendesigned.Nextthegenerationmoduleoftheestimatedvalueofautocrectionmatrixhasbeenimplemented.Thesimulationresultprovesthatth

8、egeneratedautocrectionmatrixcanbeusedtoestimatetheangelofarrivalthroughalotofDOAestimationmethodssuchasclassicMUSIC.AttheendofdatapreprocessingparttheimplementationofFPGArelatedhardwarecircuitshasbeengiven.TheVHFlightnin