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GPS
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  • 1. GPS
  • 2. What is GPS?
    • GPS is a space based all weather radio navigation system.
  • 3. GPS
    • Provides
    • Position (geographic), Velocity & Time (PVT) Quickly, Economically And Precisely 24 hours a day, anywhere in the world under the sky
  • 4. Components of GPS
            • Space segment
            • Control segment
            • User segment
  • 5. Salient steps
    • The receiver picks up the signals from the satellites;
    • Uses signal travel time to calculate distance to the satellites
    • Using Analytical Principle, position of the receiver gets calculated.
  • 6. Space segment
    • 24 satellites
    • Orbit every 12 hours at 20,200 kms
    • 4 satellites in each of 6 orbital planes
    • Transmit a uniquely coded radio signal
    • Equipped with onboard atomic standard
  • 7. What is so special about an 20200 km orbit?
    • ‘ Orbits’ twice per day
    • Large ‘viewable’ area
  • 8. Positioning With Satellite
    • Satellites are reference points to locations on earth (their location are known)
    • A location of a point on earth is identified by “triangulation”
    • Travel time of each signal is determined
    • Signals travel at Speed of light
    • Distance = Travel Time * Speed of Light
  • 9. Principle of working using GPS
    • The basis of GPS technology is precise measurement of time;
    • Use of orbiting satellite position to find location of receiver by method of resection
  • 10. Pseudoranging
  • 11. S 1 (x 1 ,y 1 ,z 1 ) S 2 (x 2 ,y 2 ,z 2 ) S 3 (x 3 ,y 3 ,z 3 ) S 4 (x 4 ,y 4 ,z 4 ) GPS Receiver  1 =  {(x 1 -x) 2 +(y 1 -y) 2 +(z 1 -z) 2 } + c. Δ t  2 =  {(x 2 -x) 2 +(y 2 -y) 2 +(z 2 -z) 2 } + c. Δ t  3 =  {(x 3 -x) 2 +(y 3 -y) 2 +(z 3 -z) 2 } + c. Δ t  4 =  {(x 4 -x) 2 +(y 4 -y) 2 +(z 4 -z) 2 } + c. Δ t Principle of GPS Positioning (X,Y,Z)
  • 12. Control segment
    • Ground-based monitoring and upload stations
    • Control orbit and timing information
  • 13. USER It includes all GPS users. User can receive the GPS signals through antenna connected to the receiver and can determine its position on the surface of the earth
  • 14. User segment
    • GPS Receivers;
    • Compatible software for Planning, Downloading and Processing of GPS receiver data;
  • 15. Some Applications of GPS
  • 16. Some Applications of GPS
  • 17. Some Applications of GPS
  • 18. Some Applications of GPS
  • 19. GPS Receivers (contd.) Navigation
    • capable of about 12 meter accuracy
    • light-weight, cheap!
    • navigation applications
  • 20. GPS data processing software
    • Real time
    • Post-processing
  • 21. GPS SIGNAL
    • CARRIER, f(t)
    • CODE, C(t)
    • NAVIGATIONAL DATA, D(t)
  • 22. CARRIERS
    • L1 (154 f or 1575.42 MHz)
    • L2 (120 f or 1227.60 MHz)
  • 23. GPS Coordinate system
    • World Geodetic System, 1984 (WGS84)
  • 24. GPS receivers Positioning Techniques
      • Absolute
      • Relative
        • Real Time
        • Post-processing
  • 25. LIMITATIONS
    • Ionospheric delay correction is not possible to compute
    • Weak signal – not available under canopy or under shed
    • Susceptible to interference
  • 26. GPS is getting popular as a means for collection of data
  • 27. GPS DATA
    • Reliable
    • Accurate
    • Real-time
  • 28. GPS
    • Can be used in any conceivable situation
    • Under the sky
    • Where the exact position of any object or phenomena involved .
  • 29.
    • Thank You