Lesson 5: Mobile Mapping Fundamentals

Nicolas MalloyAuthor: Nicolas R. Malloy


5.16 Global Navigation Satellite Systems


Global navigation satellite systems (GNSS) is the generic term for worldwide radio navigation systems using satellites to provide geographic positioning. The United States Department of Defense (DOD) established the first operational GNSS in 1994 called the Navigation System with Time and Ranging (NAVSTAR) Global Positioning System. This system, now commonly called the Global Positioning System (GPS), is comprised of three segments:

  • Space segment
  • Control segment
  • User segment

Global Positioning System: “On Target with GPS” circa 2008 NASA – US Air Force by Jeff Quitney