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§1.1 全球定位系统的产生、发展及前景 §1.2 GPS在各个领域中的应用
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GPS定位的基本观测量是观测站(用户接 收天线)至GPS卫星(信号发射天线) 的距离(或称信号传播路径),它是通 过测定卫星信号在该路径上的传播时间 (时间延迟)或测定卫星载波信号相位 在该路径上的变化周数(相位延迟)来 导出的
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GPS定位的基本观测量是观测站(用户接 收天线)至GPS卫星(信号发射天线) 的距离(或称信号传播路径),它是通 过测定卫星信号在该路径上的传播时间 (时间延迟)或测定卫星载波信号相位 在该路径上的变化周数(相位延迟)来 导出的
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第一章概论 第一节GPS的兴起与特点 一、GPS的建立 1973年由美国国防部(DOD)开始建立,称为全球定位系统 global positioning system,目的是用于美国军队的定位、导航、武器制导等。拟定由21+3颗卫星组成。到今天为止经历了4个阶段:
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Styles of kinematic GPS Kinematic GPS techniques go by a number of names with features that are often receiver specific Kinematic GPS: Early term which implies that there is no loss of lock while the receiver is moving. In survey mode, if loss of ock occurs the antenna must be returned to a point of know ocation
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Propagation Basics: - Signal, tagged with time from satellite clock, transmitted. - About66msec(20,000km) later the signal arrives at GPS receiver. Satellite has moved about 66 m during the time it takes signal to propagate to receiver
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Network Development of Network First measurements made in July 1992; just after start of International GPS Serviceigs). Since then measurements each year and often multiple campaigns per year. -The current network has over 1000 sites, many of them being recovery marks for the main
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Propagation: lonospheric delay Summary -Quick review/introduction to propagating waves -Effects of low density plasma Additional effects -Treatment of ionospheric delay in GPS processing -Examples of some results
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Examined methods for measuring distances Examined GPS codes that allow a type of distance measurement and phase to be measured Examine how the range measurements are defined Use of carrier phase measurements Examine rinEx format and look at some \raw data
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Coordinate Systems Today we cover: Definition of coordinates - Conventionalrealization of coordinates Modern realizations using spaced based geodetic systems (such as GPS)
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