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1、文华学院毕业设计（论文）外文文献翻译（本科学生用）题目：______________________________________________________________学生姓名：____________学号：_____________学部（系）:_______________________________专业年级:_______________________________指导教师：____________职称或学位：_______20年月日60外文文献翻译（译成中文1200字左右，外文内容应与自己毕业设计（论
2、文）题目相关。艺术、汉语言文学、日语专业除外）一、英文Summarizing The Global Positioning System Abstract: Global Positioning System is based on the background of the United States Department of Defense.It is designed,invested,developed,and operated by the United States Department of Defense ,
3、GPS is a satellitebased positioning and time transfering GPS positioning function has a wide range of applications in the modern measurement and a more modern building.GPSRTK technology is also widely used in modernization building, and now GPS has also been shown t
4、o be an important civilian communities of interest, and increasingly wide range of applicated. Keyword:GPS,Locating，RTK，Lay out，Survey 1. Background The 50s, the former U.S.S.R has not launched humanities first artificial earth satellite, the American scientists in
5、 along its track research in, had discovered the Doppler shift phenomenon, and has facilitated Doppler satellite navigation positioning system completing using this principle, has obtained the enormous success in the military and the civi aspect, was in a navigation
6、 localization history leap, our country once has also introduced many Doppler receiver, applied to the island association measured, the Earth explored and so on the applied to the island association measured, the Earth explored and so on the domain. But because Dopp
7、ler satellite orbit highly low, signalcarrier frequency low, the track precision enhances with difficulty, causes the pointing accuracy lowly, satisfies the geodetic survey or the project survey request, is more impossible to use in the astronomy Earth dynamics rese
8、arch. In order to enhance the satellite positioning the precision,US started from 1973 to prepare for construction global positioning syst
