12. 540 Principles of the Global Positioning System Lecture 04 Prof. Thomas Herring 02/803 12540Lec04 Review So far we have looked at measuring coordinates with conventional methods and using gravity field Examine definitions of coordinates Relationships between geometric coordinates Time systems Start looking at satellite orbits02/18/03 12.540 Lec 04 1 12.540 Principles of the Global Positioning System Lecture 04 Prof. Thomas Herring 02/18/03 12.540 Lec 04 2 Review – Examine definitions of coordinates – – Time systems – Start looking at satellite orbits • So far we have looked at measuring coordinates with conventional methods and using gravity field • Today lecture: Relationships between geometric coordinates 1