gps introductory slides
Post on 20-Jun-2015
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GPS is everywhere!!
The Global Positioning System
• 24-32 satellites• 20,200 km altitude• 55 degrees inclination• 12 hour orbital period• 5 ground control stations• Need 4 satellites to be
accurate• Each satellite passes over a
ground monitoring station every 12 hours
http://www.colorado.edu/geography/gcraft/notes/gps/gps_f.html
How actual location is determined
• Receiver position is triangulated using at least 3 satellites, 4th needed to adjust the receiver’s time.
Consumer-grade GPS accuracy• Horizontal: +/- 10 m (30 ft) error• Vertical: +/- 15 m (45 ft) error
Your location is:37o 23.323’ N
122o 02.162’ W
5
High-precision GPS accuracy
• Horizontal: +/- 1 cm error• Vertical: +/- 10 cm error
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