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Gps vehicular navigation

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gps and its applications

gps and its applications

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  • Health and movement of satellites- prepares ephimeris and almanac for each satellite and upload the file to each satellite
  • This Almanac and ephemeris received by gps reciever and is stored in its memory,,,,, the Satellite always transmits the PRC, when
  • , whether it be inland rivers or the open seas most boat owners now consider marine GPS systems an essential part of their equipment.
  • Transcript

    • 1.  
    • 2.
      • The Global Positioning System (GPS) is a worldwide radio-navigation system formed from a constellation of 24 satellites and their ground stations.
        • Provide location within meters or less anywhere on the globe.
        • Created and operated by the US Department of Defense
      • Orbit 20,000 Kms above earth
      • Satellites in 12 hour orbit
    • 3. Three Segments of the GPS Control Segment Space Segment User Segment Monitor Stations Ground Antennas Master Station
    • 4. Control Segment Kwajalein Atoll US Space Command Hawaii Ascension Is. Diego Garcia Cape Canaveral Ground Antenna Master Control Station Monitor Station
    • 5.
      • Knowing precise orbital location of satellites.
          • Almanac and ephemeris.
      • Finding the distance b/w the GPS and the satellite.
          • Distance=velocity * time
      • To find the time delay of Pseudo random code.
      • Positioning the GPS receiver.(Triangulation).
    • 6.  
    • 7.  
    • 8.  
    • 9.
      • Let the receiver coordinates be the vector: (U x , U y , U z )
      • And let the satellite coordinates be (X i , Y i , Z i ), where i = 1, 2, 3, …, the satellite number.
      • The ranging equations are thus:
        • (X 1 - U x ) 2 + (Y 1 - U y ) 2 + (Z 1 - U z ) 2 = (PR 1 – τ c) 2
        • (X 2 - U x ) 2 + (Y 2 - U y ) 2 + (Z 2 - U z ) 2 = (PR 2 – τ c) 2
        • (X 3 - U x ) 2 + (Y 3 - U y ) 2 + (Z 3 - U z ) 2 = (PR 3 – τ c) 2
        • (X 4 - U x ) 2 + (Y 4 - U y ) 2 + (Z 4 - U z ) 2 = (PR 4 – τ c) 2 where τ is the receiver clock error.
    • 10.  
    • 11.  
    • 12.
      • Better accuracy in landing enhanced flight safety and better navigation service from one point to another.
      • Decrease unnecessary travel and fuel consumption.
      • Reduced the ground based operational and maintenance cost.
    • 13.
      • To determine the position and velocity of a satellite.
      • To guide the space craft in a defined path.
      • To launch the satellite in a specific position in the space.
    • 14.
      • A  marine GPS system  is a specialized system for navigation on the water.
      • Very specific information related to the sea beds, navigable channels and other useful maritime data allows boat captains to navigate safely.
      • Fleet and other professional fishermen use marine GPS to precisely locate their vessels, track the movements of fish, and even to predict the fish location for the next day. 
    • 15.
      • Determine the position of vehicle.
      • Searching the Point of interest .
      • Search of a route that is short, less congested.
      •   As long as technology helps, as the navigation facilites will reach to a point, at which when vehicles will become smart vehicle, which is self-driven vehicles.
      • It aids the soldier in navigating without the help of a map and automatic reporting of the position of the troop to control station. 
    • 16.  
    • 17. Receiver PRN Satellite PRN Time Difference