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Global Positioning Systems. Presented by: Wesley D. Fulbright. What is GPS?. A worldwide radio-navigation formed from a constellation of 24 satellites and ground stations

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global positioning systems

Global Positioning Systems

Presented by: Wesley D. Fulbright

what is gps
What is GPS?
  • A worldwide radio-navigation formed from a constellation of 24 satellites and ground stations
  • These days GPS is finding its way into cars, boats, planes, construction equipment, movie making gear, farm machinery, even laptop computers.
  • Used to calculate positions accurate to a couple of meters
how gps works
How GPS Works…
  • Use satellites as reference points – use 3 satellites to “triangulate” position
  • The GPS receiver measures distance by using the travel time of radio signals
  • Timing is configured by using atomic clocks
  • Using a 4th satellite ensures the perfect time – if timing is off by a thousandth of a second it can mean almost 200 miles of error
where are the ground stations
Where are the Ground Stations…
  • Hawaii
  • Ascension Island
  • Diego Garcia
  • Kwajalein
  • Colorado Springs
who uses gps






Delivery Drivers




Fire Fighters

Who uses GPS?
types of errors
Types of Errors
  • Passing through the different layers of the atmosphere slows the wave down
  • Local obstructions on the ground
  • Atomic clock errors
  • Using satellites that are close together
the end

The End