全球定位系统概述 毕业设计(论文)外文文献翻译.doc

33 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 34 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 is designed,invested,developed,and operated by the United States Department of Defense ,GPS isa satellitebased positioni ng and time transfering GPS positioning function has a wide range of applicat ions in the modern measurement and a more modern techn ology is also widely used in modernization building, and now GPS has also b een shown to be an important munities of interest, and increasingl y wide range of applicated. Keyword:GPS,Locating , RTK , Lay out , Survey 1. Background The 50s, the former has not launched humanities first artificial earth satellite, the American scientists in along its track research in, had discovered the Doppler shift phenomenon, and has facilitated Doppler satellite navigation positioning pleting using this principle, has obtained the enormou s ess in the military and the civi aspect, was ina navigation localization h istory leap, our country once has also introduced many Doppler receiver, appl ied to the island association measured, the Earth explored and so on the applie d to the island association measured, the Earth explored and so on the domain. But because Doppler satellite orbit highly low, signalcarrier frequency low, t he track precision enhances with difficulty, causes the pointing accuracy lowl y, satisfies the geodetic survey or the project survey request, is more impossib le to use in the astronomy Earth dynamics research. In order to enhance the sa tellite positioning the precision,US started from 1973 to prepare for constructi on global