cET 318 The ThIrd Lecture 1 Introduction 3. Reference Systems Book: p 25-38 Dr Guoqing Zhou 1.1 Overview 1.2 A Group of Basic Ce GPS Basic Positioning Principle 1. Sun and Earth Spring Two reference systems: Time and Coordinate 2. Earth 3. Celestial body .lz1 4. Ecliptic Plane 5. Earth equator Autumn n-known 6. Celestial equator known 3 7. Greenwich Meridian Coordinat 8. Vernal equinox 9. Node 2. Space-fixed Coordinate System 0. Perigee 13. Earth-fixed Coordinate System I 1.Apogee 14. Artificial Earth Satellite 15. Orbital Plane 16. Orbital plane Coordinate 巴:条1 Dr. Guoqing Zhou 3. Reference Systems CET 318 Book: p. 25-38 1. Introduction • GPS Basic Positioning Principle • Two reference systems: Time and Coordinate Syst a 2 3 known known known 1 Un-known a a GPS Satellite GPS Receiver Time System Coordinate System S=vt 1.1 Overview 1.2 A Group of Basic Concepts 1. Sun and Earth 2. Earth 3. Celestial body 4. Ecliptic Plane 5. Earth Equator 6. Celestial equator 7. Greenwich Meridian 8. Vernal Equinox Sun Spring Winter Autumn Summer 9. Node 10.Perigee 11.Apogee 12. Space-fixed Coordinate System 13. Earth-fixed Coordinate System 14. Artificial Earth Satellite 15. Orbital Plane 16. Orbital plane Coordinate System