江苏专用高考英语专题三阅读理解第二节分类突破九词句猜测_代词指代题课件.pptx

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1、九、词句猜测——代词指代题专题三第二节分类突破感悟体会名师点津内容索引随堂限时练感悟体会(2018·常州期末)GPStechnologyisoneofthelatestandgreatestdevelopmentswithinthecommunicationsworld.Alsoknownasa“globalpositioningsystem”，thistechnologyworksoffofradiosignalssentoutbysatellitesinspace.Sinceacellphonealreadyworkslikeatwo-wayradiowhencommunica

2、tingwithcelltowers，theGPScapabilitysimplyextendstheradiosignalreachtospacesatellites.Phonesequippedwithfull-featuredcapabilitiesworkoffofJava-basedradiosignalsandhavedatabaseaccesstotheirproviders’systemforotherdatalikemappingandvoices.Locationtracking，andgivingdirectionstoandfromdestinationsa

3、resomeofthemorecommonusesforthistechnology.GPSnavigationalsystemsaresupportedbyanetworkof27satellites.ThesesatellitesorbittheEarthincyclicpatterns24hoursaday.Atanygiventime，aminimumoffoursatellitessignalsisaccessibletoanyonepointonEarth.Wheneverareceiverdeviceisactivated，radiowaveswithcodedmes

4、sagesaresentouttoit.Thisishowsatellitesknowtostarttrackingthedevice.Areceiver’sexactlocationisdeterminedthroughaprocesscalledtrilateration(三边测量法)wherethreesatellitesworktogethertonarrowdownpossiblelocationpoints.Afourthsatelliteisneededifthereceiverisn’tonthegroundandaltitudeiswantedaswell.Dis

5、tancecalculationsaremadebasedonhowlongittakestheradiosignalstotravelbackandforthbetweenreceiverandsatellites.Themappingcapabilitiesaredisplayedonthephone’sscreenviathecellprovider’sdatabase.AsaGPSdeviceneedstodoallkindsofcalculationsondifferentdatafromsatellitesandprovider’sdatabase，itconsumes

6、time.SoitcantakequiteafewsecondsforaregularGPStoworkoutaplan.AnassistedGPScanhelpsolvetheproblem.Itisanimprovedtechnologythatusesacellnetwork’sAssistanceServerwhichisconnectedtoareferencenetworksuchastheInternet.Throughtheuseofcelltowers，aphonerelayssatellitesignalinformationtotheservers.These

7、serversareabletoprocessincomingdataatmuchhigherratesthanGPSreceivers，soinformationisprocessedquicker，andistypicallymoreaccurate.语篇解读本文介绍了GPS技术是如何在手机中运行的。语篇解读1.Whatdoestheunderlinedword“their”referto?A.Satellites’.B.Phones’.C.Signals’.D.