Global Positioning Systems

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Global Positioning Systems
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• Global Positioning Systems-
• A system of satellites for determining exact
  location on the earth
• A more complicated definition
• Global Positioning Systems (GPS) are space-based
  radio positioning systems that provide 24 hour
  three-dimensional position, velocity and time
  information to suitably equipped users anywhere
  on or near the surface of the Earth (and
  sometimes off the earth). http//www.redsword.com/
  gps/old/index.htmintroduction

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It is all about location

• How do you know where you are?
• How do you think that people navigated before
  GPS?
• How did they navigate before the invention of the
  compass?
• Could you tell me how you could find out your
  location...without using Google Earth

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Location, Location, Location

• Lets watch these videos
• http//video.google.com/videoplay?docid6164350560
  364300786qGPShlen (NASA)
• http//www.youtube.com/watch?vFL-ZPC9fx98
• (Pioneer AVIC-HD1BT - In Car GPS and
  Entertainment)

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Trilateration
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Samples of GPS units
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How does it work?

• The satellites send signals
• the signals are interpreted by the receiver
• A form of triangulation is used to determine
  location (x, y, z)
• Time is also coordinated so that movement can be
  traced
• Used for exact location (one point) or for
  multiple points (important for navigation)

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Applications

• Navigation (land, water, air)
• Agriculture
• Remote Sensing verification
• Surveying
• Military (i.e., missle guidance)
• Utilities
• Real time mapping