Global positioning system
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Global positioning system Presentation Transcript

  • 1. Global Positioning System BY DHIREN PARYANI 0206CS111026
  • 2. What is the GPS?  Orbiting navigational satellites  Transmit position and time data  Handheld receivers calculate  latitude  longitude  altitude  velocity  It is maintained by the US government and is freely accessible to anyone with a GPS receiver
  • 3. History of the GPS  1969—Defense Navigation Satellite System (DNSS) formed  1973—NAVSTAR Global Positioning System developed  1978—first 4 satellites launched Delta rocket launch
  • 4. History of the GPS  1993—24th satellite launched; initial operational capability  1995—full operational capability  May 2000—Military accuracy available to all users
  • 5. How does GPS work?  Measuring distance by measuring time Satellites send coded signals indicating their position in space and the exact time the signals are being sent  Receivers use the time it takes signal to travel from satellite to receiver to determine distance from satellite to receiver  Information from multiple satellites is used to determine position through ‘triangulation’ 
  • 6. Three Segments of the GPS Space Segment User Segment Control Segment Ground Antennas Master Station Monitor Stations
  • 7. Control Segment US Space Command Hawa ii Cape Canaveral Kwajalein Atoll Ascension Is. Master Control Station Diego Garcia Monitor Station Ground Antenna
  • 8. Space Segment
  • 9. User Segment Military.  Search and rescue.  Disaster relief.  Surveying.  Marine, aeronautical and terrestrial navigation.  Remote controlled vehicle and robot guidance.  Satellite positioning and tracking.  Shipping.  Geographic Information Systems (GIS).  Recreation. 
  • 10. GPS Communication and Control
  • 11. GPS receivers  A GPS receiver's job is to locate four or more satellites, figure out the distance to each, and use this information to deduce its own location.    Hand-held receivers for recreational use with accuracy of 10-15 meters Vehicle mounted receivers for navigation or agricultural use with accuracy of < 1 meter Backpack or tripod mounted receivers for surveying use with accuracy of 5 – 10 centimeters
  • 12. More about GPS receivers  Receivers require clear line-of-sight; thus, they will not work indoors or where tall objects obscure the sky
  • 13. Errors  Troposphere causes delays in code and carrier But they aren’t frequency dependent But the errors are successfully modeled  Errors due to Multipath  Receiver noise
  • 14. Errors  Forces on the GPS satellite  Earth is not a perfect sphere and hence uneven gravitational potential distribution  Other heavenly bodies attract the satellite, but these are very well modeled  Not a perfect vacuum hence drag but it is negligible at GPS orbits  Solar radiation effects which depends on the surface reflectivity, luminosity of the sun, distance of to the sun. this error is the largest unknown errors source
  • 15. DGPS  Errors in one position are similar to a local area  High performance GPS receiver at a known location.  Computes errors in the satellite info  Transmit this info in RTCM-SC 104 format to the remote GPS
  • 16. Application of GPS Technology  Location - determining a basic position  Navigation - getting from one location to another  Tracking - monitoring the movement of people and things  Mapping - creating maps of the world  Timing - bringing precise timing to the world
  • 17. Application of GPS Technology  Private and recreation  Traveling by car  Hiking, climbing, biking  Vehicle control  Mapping, survey, geology  English Channel Tunnel  Agriculture  Aviation  General and commercial  Spacecraft  Maritime
  • 18. Screen Capture of a GPS enabled phone
  • 19. GPS Navigation
  • 20. Any Queries?
  • 21. Thank You!!