1、 本科毕业设计 英文翻译 专业名称 通信工程 学生姓名 单锦贵 指导教师 张光龙 完成时间 2013.5.30 本科毕业设计英文翻译 指导教师评阅意见 学生姓名： 单锦贵 班级： 121901 得分： 请指导教师用红笔在译文中直接进行批改，并就以下几方面填写评阅意见，给出综合得分（满分按 15 分计）。 1、专业术语、词汇翻译的准确性； 2、翻译材 料是否与原文的内容一致； 3、翻译材料字数是否符合要求； 4、语句是否通顺，是否符合中文表达习惯。 指导教师（签名）： 年 月 日 Introduction to the Global Positioning System What is GPS?
2、 The Global Positioning System (GPS) is a location system based on a constellation of about 24 satellites orbiting the earth at altitudes of approximately 11,000 miles. GPS was developed by the United States Department of Defense (DOD), for its tremendous application as a military locating utility.
3、The DODs investment in GPS is immense. Billions and billions of dollars have been invested in creating this technology for military uses. However, over the past several years, GPS has proven to be a useful tool in non-military mapping applications as well. GPS satellites are orbited high enough to a
4、void the problems associated with land based systems, yet can provide accurate positioning 24 hours a day, anywhere in the world. Uncorrected positions determined from GPS satellite signals produce accuracies in the range of 50 to 100 meters. When using a technique called differential correction, us
5、ers can get positions accurate to within 5 meters or less. Today, many industries are leveraging off the DODs massive undertaking. As GPS units are becoming smaller and less expensive, there are an expanding number of applications for GPS. In transportation applications, GPS assists pilots and drive
6、rs in pinpointing their locations and avoiding collisions. Farmers can use GPS to guide equipment and control accurate distribution of fertilizers and other chemicals. Also，GPS is used for providing accurate locations and as a navigation tool for hikers, hunters and boaters. Many would argue that GP
7、S has found its greatest utility in the field of Geographic Information Systems (GIS). With some consideration for error, GPS can provide any point on earth with a unique address (its precise location). A GIS is basically a descriptive database of the earth (or a specific part of the earth). GPS tells you that you are at point X,Y,Z while GIS tells you that X,Y,Z is an oak tree, or a spot in a stream with a pH level of 5.4. GPS tells us the where. GIS tells us the what. GPS/GIS is reshaping the way we locate, organize, analyze and map our resources.
