WELCOME
INSTITUTE OF TECHNOLOGY      & MANAGEMENT        PRESENTATION ON                GPS  PREPARED BY   : KUNAL PRAKASH MISHRA ...
CONTENTS   Introduction   Working   Different segments of GPS   Primary function of GPS   GPS position location princ...
INTRODUCTIONIt is global positioning system used for positionlocation & navigation.It is a network of 24 NAVSTAR satellite...
contd…    It provides a direct readout of the presentposition of a GPS receiver with a typical accuracy                   ...
CONTROL SEGMENTA control segment is composed of :1.A master control station2.Four dedicated ground stations3.Six dedicated...
Three Segments of the GPS   Space Segment                                           User Segment            Control Segmen...
Control Segment      US Space Command                 Cape Canaveral  Hawaii                                              ...
Space Segment
User Segment   Military.   Search and rescue.   Disaster relief.   Surveying.   Marine, aeronautical and terrestrial ...
Four Primary Functions of GPS   Position and coordinates.   The distance and direction between any two    waypoints, or ...
Position is Based on TimeRadio waves travel at the speedof light. If GPS signal leavessatellite at time “T”…              ...
Pseudo Random Noise Code               Time               Difference                            Satellite PRNReceiver PRN
GPS RECEIVER
Signal From One Satellite                     The receiver is                     somewhere on                     this sp...
Signals From Two Satellites
Three Satellites (2D Positioning)
Triangulating Correct Position
Three Dimensional (3D) Positioning
Sources of GPS ErrorStandard Positioning Service (SPS ): Civilian Users      Source                Amount of Error    Sat...
Sources of Signal InterferenceEarth’s Atmosphere         Solid Structures                      Metal   Electro-magnetic Fi...
Ideal Satellite Geometry               NW                              E               S
Good Satellite Geometry
Poor Satellite Geometry               NW                             E               S
Poor Satellite Geometry
Real Time Differential GPS                                                x+5, y-3        x+30, y+60                      ...
A visual example of the GPS constellation in motion with the Earth rotating. Notice how the number of satellites in view f...
APPLICATIONGPS has become a widely used & useful tool forcommerce, scientific uses , tracking &surveillance.1.Surveying2.m...
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sumit gps

  1. 1. WELCOME
  2. 2. INSTITUTE OF TECHNOLOGY & MANAGEMENT PRESENTATION ON GPS PREPARED BY : KUNAL PRAKASH MISHRA ECE 4’th YR.
  3. 3. CONTENTS Introduction Working Different segments of GPS Primary function of GPS GPS position location principle PSEUDO RANDOM NOISE code Equations involved Sources of signal interference GPS receiver DGPS Applications of GPS
  4. 4. INTRODUCTIONIt is global positioning system used for positionlocation & navigation.It is a network of 24 NAVSTAR satellites orbitingaround earth at an altitude of approx. 20200 kms.In this system satellites are placed in MEOIt consists of satellites ,receivers & groundcontrol systems.It is operated on L –band frequency(1-2GHz).A GPS works in any weather condition
  5. 5. contd… It provides a direct readout of the presentposition of a GPS receiver with a typical accuracy of 30 m. The orbital period of a satellite is approx. one- half a sidereal day (11hr 58 min) LORAN is also used for position location There are three segments of a GPS & theyare:1. Control segment2. Space segment3. User segment
  6. 6. CONTROL SEGMENTA control segment is composed of :1.A master control station2.Four dedicated ground stations3.Six dedicated monitor stations
  7. 7. Three Segments of the GPS Space Segment User Segment Control Segment Ground AntennasMaster Station Monitor Stations
  8. 8. Control Segment US Space Command Cape Canaveral Hawaii Kwajalein Atoll Diego Garcia Ascension Is.Master Control Station Monitor Station Ground Antenna
  9. 9. Space Segment
  10. 10. 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.
  11. 11. Four Primary Functions of GPS Position and coordinates. The distance and direction between any two waypoints, or a position and a waypoint. Travel progress reports. Accurate time measurement.
  12. 12. Position is Based on TimeRadio waves travel at the speedof light. If GPS signal leavessatellite at time “T”… T …and is picked up by the T+3 receiver at time “T + 3.” Then distance between satellite and receiver = “3 times the speed of light”
  13. 13. Pseudo Random Noise Code Time Difference Satellite PRNReceiver PRN
  14. 14. GPS RECEIVER
  15. 15. Signal From One Satellite The receiver is somewhere on this sphere.
  16. 16. Signals From Two Satellites
  17. 17. Three Satellites (2D Positioning)
  18. 18. Triangulating Correct Position
  19. 19. Three Dimensional (3D) Positioning
  20. 20. Sources of GPS ErrorStandard Positioning Service (SPS ): Civilian Users Source Amount of Error  Satellite clocks: 1.5 to 3.6 meters  Orbital errors: < 1 meter  Ionosphere: 5.0 to 7.0 meters  Troposphere: 0.5 to 0.7 meters  Receiver noise: 0.3 to 1.5 meters  Multipath: 0.6 to 1.2 meters  User error: Up to a kilometer or moreErrors are cumulative
  21. 21. Sources of Signal InterferenceEarth’s Atmosphere Solid Structures Metal Electro-magnetic Fields
  22. 22. Ideal Satellite Geometry NW E S
  23. 23. Good Satellite Geometry
  24. 24. Poor Satellite Geometry NW E S
  25. 25. Poor Satellite Geometry
  26. 26. Real Time Differential GPS x+5, y-3 x+30, y+60 x-5, y+3 Receiver DGPS Receiver DGPS SiteDGPS correction = x+(30-5) and True coordinates =y+(60+3) x+0, y+0True coordinates = x+25, y+63 Correction = x-5, y+3
  27. 27. A visual example of the GPS constellation in motion with the Earth rotating. Notice how the number of satellites in view from a given point on the Earthssurface, in this example at 45°N, changes with time.
  28. 28. APPLICATIONGPS has become a widely used & useful tool forcommerce, scientific uses , tracking &surveillance.1.Surveying2.map-making3.Navigation4.Cellular telephony5.Tectonics( fault motion measurement inearthquakes)6.Geofencing (vehicle ,person trackingsystems)7. Military
  29. 29. Any query ???

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