欢迎来到天天文库
浏览记录
ID:9860511
大小:25.16 KB
页数:6页
时间:2018-05-12
《外文翻译---gps全球卫星定位系统》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、在注重素质教育的今天,社会实践活动一直被视为高校培养德、智、体、美、劳全面发展的优秀人才的重要途径。暑期社会实践活动是学校教育向课堂外的一种延伸,也是推进素质教育进程的重要手段。它有助于当代大学生接触社会,了解社会。同时,实践也是大学生学习知识、锻炼才干的有效途径,更是大学生服务社会、回报社会的一种良好形式。时光荏苒,岁月如白驹过隙,不经意间,我们即将从多彩的大学毕业,完成一个从大学生到社会人的转变。四年的大学生涯,让我明白了许许多多的科学知识和人生哲理,以及数不尽的感悟和成长。然只有将所学的理论知识付诸于社会的实践,才能检验和实现理论自
2、身的价值,也只有将理论付诸于实践才能使理论得以检验。同样,一个人的价值也是通过实践活动来实现的,也只有通过实践才能锻炼人的品质,彰显人的时代风貌。而毕业实习作为大学的最后一课,也是最后一刻,我倍加珍惜,从而可以较深层次的理解社会,以便为将来能更好的胜任工作打下坚实的基础。英文文献TheGlobalPositioningSystemTheglobalPositioningSystem(GPS)isrevolutionizingsurveyingtechnology,Likeitspredecessor,theTEANSITDopplersy
3、stem,GPSshiftsthesceneofsurveyingoperationsfromground-to-groundmeasurementstoground-to-sky,withobviousimplications:intervisibilityofmarksisnolongeracriteionfortheirlocation;operationsarepossibleinnearlyallkindsofweatherandbeperformedduringdayornight;andtheskillsrequiredto
4、utilisethetechnologyaredifferentbothinfieldoperationsanddataprocessing.ButGPSisnotmerelyareplacementforTRANSIT.Thesimultaneousvisibilityofmultiplesatellitesallowseffectivecancellationofthemajorsourcesoferrorinsatelliteobservations,withtheresultthatwithGPS,relativeposition
5、ingaccuraciesofonepartpermillion(ppm)orbetteroverdistancesfromonekilometertothousandsofkilometersarepossible.ThismeansthatGPScancompetewithterrestrialtechniquesovershortdistances,andcanachievemoreaccurateresultsinlesstimethanTRANSITobservationsoverlongerdistances.GPSwasde
6、signedprimarilyasanavigationsystem,tosatisfybothmilitaryandcivilianneedsforreal-timepositioning.Thispositioningisaccomplishedthroughtheuseofcodedinformation,essentiallyclevertimingsignals,transmittedbythesatellites.EachGPSsatellitetransmitsauniquesignalontwoL-bandfrequenc
7、ies:Aat1575.42MHzandBat1227.60MHz(equivalenttowavelengthsofapproximately19and24cm,respectively).ThesatellitesignalsconsistoftheL-bandcarrierwavesmodulatedwitha"Standard"or Scode(formerlycalledtheC/Acode),a"Precise"orPcodeandaNavigationMessagecontaining,amongstotherthings,
8、thecoordinatesofthesatellitesasfunctionsoftime---the"BroadcastEphemerides".TheScodewhichisintend
此文档下载收益归作者所有