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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
• 15. Some Applications of GPS
• 16. Some Applications of GPS
• 17. Some Applications of GPS
• 18. Some Applications of GPS
• capable of about 12 meter accuracy
• light-weight, cheap!
• 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