Basics of the GPs Technique: Observation Equations Geoffrey blewitt Department of Geomatics, University of Newcastle Newcastle upon Tyne NEl 7RU, United Kingdom

1.1 Point Positioning with Code ranges Epoch at t Additional Satellites(Simultaneously): L Code Range Observation Equatio

1.1 Data Handling 1. 2 Cycle Slip Detection and Repair

3. Adjustment, Filtering, and Smoothing-----Overview

1. 1 Error Categories 1. Errors related to GPs Satellites 2. Errors related to GPS signal propagation

Fundamental knowledg Quick Overview Kelperian 3 Laws First Law: ellipse, Sun is a focus Second law: the same area in same time Earth

3. Reference Systems Book: p 25-38 Dr Guoqing Zhou 1.1 Overview 1.2 A Group of Basic Ce GPS Basic Positioning Principle

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

GPS Basic Positioning Principle Two reference systems: Time and Coordinate Syst

1卫星在空间绕地球运行时,除了受地球重力场的引 力作用外,还受到太阳、月亮和其它天体的引力影 响,以及太阳光压、大气阻力和地球潮汐力等因素 影响 口若假设地球引力场的影响为1,其它引力场的影响均小于 105