Global positioning System

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Global positioning System

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Global positioning System

  1. 1. Introduction To G.P.S. Submitted to :- Submitted By :- Mr. Sandeep Rahul Rajput Lecturer 11070125 COE Deptt. COE-A
  2. 2. Humans have always been Interested in knowing where Things are………..
  3. 3. Where to go
  4. 4. Early Solutions: • marking trails with piles of stones (problems when snow falls…or on ocean) • navigating by stars (requires clear nights and careful measurements) most widely used for centuries …location within a mile or so Modern Ideas: • RADAR • SONAR
  5. 5. History of the GPS • Developed by US Department of Defense • 1969—Defense Navigation Satellite System (DNSS) formed • 1973—NAVSTAR Global Positioning System developed • 1978—first 4 satellites launched
  6. 6. • 1993—24th satellite launched; initial operational capability • 1995—full operational capability • May 2000—Military accuracy available to all users
  7. 7. What is GPS and how it works? GPS, which stands for Global Positioning System, is the only system today able to show you your exact position on the Earth anytime, in any weather, anywhere.
  8. 8. Satellites There are quite a number of satellites out there in space. They are used for a wide range of purposes: satellite TV, cellular phones, military purposes and etc. Satellites can also be used by GPS receivers.
  9. 9. GPS Satellites The GPS Operational Constellation consists of 24 satellites that orbit the Earth in very precise orbits twice a day. GPS satellites emit continuous navigation signals.
  10. 10. GPS determines locations in Earth centered, Earth fixed (ECEF)
  11. 11. Triangulation Geometric Principle: You can find one location if you know its distance from other, already-known locations.
  12. 12. Velocity x Time = Distance Signal leaves satellite at time “T” T Velocity x Time = Distance T+3 Distance between satellite and receiver = “3 times the speed of light”
  13. 13. Triangulation
  14. 14. Triangulation
  15. 15. Triangulation
  16. 16. GPS is based on satellite ranging, i.e. distance from satellites …satellites are precise reference points …we determine our distance from them we will assume for now that we know exactly where satellite is and how far away from it we are… if we are lost and we know that we are 11,000 miles from satellite A… we are somewhere on a sphere whose middle is satellite A and diameter is 11,000 miles
  17. 17. •Distance measurements from two satellites limits our location to the intersection of two spheres, which is a circle.
  18. 18. •A third measurement narrows our location to just two points.
  19. 19. •A fourth measurement determines which point is our true location
  20. 20. Applications of GPS MILITARY • Navigation • Target tracking • Search and Rescue
  21. 21. Applications of GPS CIVILIAN Purposes: • GPS for surveying • Mapping • Finding lost vehicles
  22. 22. Applications: Monitoring of Fishing Fleet • In Europe quota system • Fishermen only allowed to catch certain amount of a particular species of fish on a particular fishing ground • Trials of monitoring fleet incorporating GPS data
  23. 23. References • http://www.howstuffworks.com/gps.htm •http://www.howstuffworks.com/38- how-gps-works-video.htm • http://en.wikipedia.org/

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