东北农业大学：《精细农业》课程教学资源（PPT课件）第二章 GPS（全球定位系统及其应用）

– 空间部分 – 地面控制部分 – 用户设备部分

1、GPS的组成;(重点) 2、GPS的坐标系统;(重点) 3、GPS的定位原理与方法。(难点)

GPS Observables Today's class we start discussing the nature of GPS observables and the methods used to make range and phase measurements Start with idea of remotely measuring distances

武汉大学测绘学院：《GPS原理及其应用》课程教学资源（PPT课件讲稿）第二章 全球定位系统的组成及信号结构 2.2 GPS卫星的信号结构

GPS Groups/Gs There are many international and national groups involved in the deployment of GPS The international organization is the International GPs Service(IGs)

Today's Lecture Examine specifics of GPS signals Multiple modulations on same carrier signal Structure of signals GPS receiver operation and satellite acquistion

Primary research programs Geophysical research GPS analysis packages GAMIT (GPS at MIT): Uses double differences GYPSY: Jet Propulsion Laboratory (JPL) processing packages: Uses one-way observables and explicitly estimates clocks Bernese: Developed at Astronomical Institute

Treat the basic description and dynamics of satellite orbits Major perturbations on GPS satellite orbits · Sources of orbit information: -SP3 format from the International GPS service Broadcast ephemeris message

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