自动化外文文献.doc外文文献原稿和译文原稿BeidoupositioningPrefaceNavigationsatellitesystemscanprovidealltime,uracypositioning,navigationandtimingservicestousersontheearthsurfaceorinthenear-,,economy,military,,,ChinesepeopleusedtheBigDipper(Beidou)foridentifyingdirections,andinventedtheworld'sfirstnavigationdevice,pass(Sinan\,theChinese-PASS),ChinabegantoactivelystudythenavigationsatellitesystemsinlinewithChina',BeiDouNavigationDemonstrationSystemisbasicallyestablished,,eleratingtheconstructionoftheBeiDouNavigationSatelliteSystem,'snationalsecurity,economicdevelopment,technologicaladvancesandsocialprogress,,,theBeiDousystemwilljointlypromotethedevelopmentofsatellitenavigationindustry,makecontributionstohumancivilizationandsocialdevelopment,:spaceconstellation,-°E,80°E,°E,140°Eand160°-,500kmandaninclinationof55°,,00()kmandaninclinationof55°,whichareevenlydistributedint
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