全球定位系統(tǒng)的介紹外文翻譯-通信工程-展示頁
2025-05-27 16:13本頁面
【正文】 only 3 satellites. Based on this example, you can see that you need to know the following information in order to pute your position: A) What is the precise location of three or more known points (GPS satellites)? B) What is the distance between the known points and the position of the GPS receiver? Chapter Three: How the Current Locations of GPS Satellites are Determined GPS satellites are orbiting the Earth at an altitude of 11,000 miles. The DOD can predict the paths of the satellites vs. time with great accuracy. Furthermore, the satellites can be periodically adjusted by huge landbased radar systems. Therefore, the orbits, and thus the locations of the satellites, are known in advance. Today39。 畢 業(yè) 設(shè) 計(jì)（論 文） 外 文 參 考 資 料 及 譯 文 譯文題目： Introduction to the Global Positioning System 全球定位系統(tǒng)的介紹 學(xué)生姓名： 學(xué) 號： 專 業(yè)： 通信工程 所在學(xué)院： 指導(dǎo)教師： 職 稱： 201x 年 xx 月 xx 日 Introduction to the Global Positioning System From “Corvallis Microtechnology, Inc. 1996” Chapter One: What is GPS? 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. The DOD39。s 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 nonmilitary mapping applications as well. GPS satellites are orbited high enough to avoid 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, users can get positions accurate to within 5 meters or less. Today, many industries are leveraging off the DOD39。s GPS receivers store this orbit information for all of the GPS satellites in what is known as an almanac. Think of the almanac as a bus schedule advising you of where each satellite will be at a particular time. Each GPS satellite continually broadcasts the almanac. Your GPS receiver will automatically collect this information and store it for future reference. The Department of Defense constantly monitors the orbit of the satellites looking for deviations from predicted values. Any deviations (caused by natural atmospheric phenomenon such as gravity), are known as ephemeris errors. When ephemeris errors are determined to exist for a satellite, the errors are sent back up to that satellite, which in turn broadcasts the errors as part of the standard message, supplying this information to the GPS receivers. By using the information from the almanac in conjuction with the ephemeris error data, the position of a GPS satellite can
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