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1、毕业设计（论文）外文参考资料及译文译文题目：IntroductiontotheGlobalPositioningSystem 全球定位系统的介绍学生姓名：学号：专 业：通信工程所在学院：指导教师：职 称：IntroductiontotheGlobalPositioningSystem---------From“CorvallisMicrotechnology,Inc.1996”ChapterOne:WhatisGPS?TheGlobalPositioningSystem(GPS)isalocationsystembasedonaconstellation
2、ofabout24satellitesorbitingtheearthataltitudesofapproximately11,000miles.GPSwasdevelopedbytheUnitedStatesDepartmentofDefense(DOD),foritstremendousapplicationasamilitarylocatingutility.TheDOD'sinvestmentinGPSisimmense.Billionsandbillionsofdollarshavebeeninvestedincreatingthistechnologyf
3、ormilitaryuses.However,overthepastseveralyears,GPShasproventobeausefultoolinnon-militarymappingapplicationsaswell.GPSsatellitesareorbitedhighenoughtoavoidtheproblemsassociatedwithlandbasedsystems,yetcanprovideaccuratepositioning24hoursaday,anywhereintheworld.Uncorrectedpositionsdetermi
4、nedfromGPSsatellitesignalsproduceaccuraciesintherangeof50to100meters.Whenusingatechniquecalleddifferentialcorrection,userscangetpositionsaccuratetowithin5metersorless.Today,manyindustriesareleveragingofftheDOD'smassiveundertaking.AsGPSunitsarebecomingsmallerandlessexpensive,thereareane
5、xpandingnumberofapplicationsforGPS.Intransportationapplications,GPSassistspilotsanddriversinpinpointingtheirlocationsandavoidingcollisions.FarmerscanuseGPStoguideequipmentandcontrolaccuratedistributionoffertilizersandotherchemicals.Also，GPSisusedforprovidingaccuratelocationsandasanavig
6、ationtoolforhikers,huntersandboaters.ManywouldarguethatGPShasfounditsgreatestutilityinthefieldofGeographicInformationSystems(GIS).Withsomeconsiderationforerror,GPScanprovideanypointonearthwithauniqueaddress(itspreciselocation).AGISisbasicallyadescriptivedatabaseoftheearth(oraspecificpa
7、rtoftheearth).GPStellsyouthatyouareatpointX,Y,ZwhileGIStellsyouthatX,Y,Zisanoaktree,oraspotinastreamwithapHlevelof5.4.GPStellsusthe"where".GIStellsusthe"what".GPS/GISisreshapingthewaywelocate,organize,analyzeandmapourresources.ChapterTwo:Trilateration-HowGPSDeterminesaLocationInanuts
