专业英语——GNSS介绍双语PPT.ppt

《专业英语——GNSS介绍双语PPT.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、全球导航定位系统GNSSGlobalNavigationSatelliteSystem123contentsThebriefintroductionofGNSSTheconstellationsofGNSSTheapplicationofGNSS1.ThebriefintroductionofGNSSItisconstellationofsatellitesdesignedtoprovidepositioningandtiminginformationforusersonearthorinspace.Itisrefer

2、stoalltheglobalandregionalsatellitenavigationsystemandtheenhancesystem.ThecomponentofGNSSGPSGLONASSBeidouGNSSGALILEO1.ThebriefintroductionofGNSS2.TheConstellationsofGNSS2.1GPSBasicInformation24satellites6orbitalplanesonalmostcircularorbitsanaltitudeofabout20,200

3、kmabovethesurfaceoftheearthinclinedby55°withrespecttotheequatororbitalperiodsofapproximately11hours58minutesdesignedandrealizedbytheU.S.DepartmentofDefensethemilitaryapplication,commercialandpublicsectorusers2.1GPSGPShasmadeaconsiderableimpactonalmostallposition

4、ing,navigation,timingandmonitoringapplications.ItprovidesparticularlycodedsatellitesignalsthatcanbeprocessedinaGPSreceiver,allowingthereceivertoestimateposition,velocityandtime.Eg:placingGPSreceiversonoceanbuoystomeasurewaveheightanddirection,monitoringtheearth’

5、scrustaldeformations,andsensingtheatmosphereusingoccultationtechniques,suchasthoseaccomplishedusingCHAMPsatellite.2.TheConstellationsofGNSS2.2GLONASSBasicInformation24satellites(12October,1982~1995)In3orbitseparatedby64.8°intheequatorialplaneAnaltitudeofabout19,

6、130kmabovethegroundsurfaceAnorbitalperiodof11:15:14OperatedbytheMinistryofDefenseoftheRussianFederation.2.TheConstellationsofGNSS2.2GLONASSFutureThefutureseemeduncertainduetoeconomicproblemsfacingtheRussianFederationoverthepastfewyears.Thenumberofoperationalsate

7、lliteswassteadilydecreasing.AsofJanuary2006,atotalof10satellitesareoperational.ButGLONASSwasrecoveredandrestoredin2011.Inrecentyears,uncertaintyaboutthefutureoftheGLONASSsystemhaslimitedthedemandandavailabilityofreceiverstoprocessthesignals.2.TheConstellationsof

8、GNSS2.3GalileoBasicInformation30satellites3orbitalplanesonalmostcircularorbitsanaltitudeofabout23,222kmabovethesurfaceoftheearthinclinedby56°withrespecttotheequatoror