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Group presentation

Group presentation. Topic :. How does gps work?. Group memebers :. Kanwar pannu. Pouya agahtehrani. Ronak Patwa. Sayed alam. What is GPS ?.

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Group presentation

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  1. Group presentation Topic : How doesgps work? Group memebers: Kanwarpannu Pouyaagahtehrani RonakPatwa Sayedalam

  2. What is GPS ? A navigation device used to determine a particular point of location on sea, land and air; anytime, anywhere and any environment with high degree of accuracy.

  3. GPS Segments • Satellites • At least 24 satellites are orbiting around the world and sending signal continuously • Signals are unique for each Satellite • Signal contains the location of the satellites and the transmitted time • Control and monitoring stations • monitor the orbiting of satellites • ensures that GPS satellite orbits remain within limits

  4. GPS Segments • GPS receivers • GPS receivers do not transmit signals to the satellites • Receivers measure the distance of satellite by calculating the transmission time and receiving time • Receivers use regular Quartz clock while satellites use atomic clocks • Receivers’ primary job is to identify at least four satellites at any time

  5. Position Determination • Trilateration Method • At least three satellites are required to locate a position on earth • While orbiting around the earth each satellite sends signal to a circular area • When two spheres intersect each other, it covers a wide range of area • The third satellite’s sphere helps to find the exact location of the receiver on earth surface Please see note for citation

  6. Signal Frequency • L1 Frequency • L2 Frequency • Use civilian receivers • 1575.42 MHz • Use Standard Positioning Code (SPS) • Transmit data at 1.023 million chips per second • Use military receivers • 1.2276 Frequency • Use P-code andencrypted P(Y) code • Transmit data at 10.23 million chips per second

  7. Signal Modulation • Pseudo Random Code • PRN is used to identify the satellite that is transmitting signals to the receivers • Almanac Data • Almanac data represents the orbital position of a satellite • Ephemeris Data • Ephemeris data is used to accurately locate a GPS satellite at a particular point in its orbit in a specific time

  8. Error Factors • Ionosphere and Troposphere delays • Signal Multipath • Receiver Clock Errors • Orbital Errors • Satellite Geometry/Shading

  9. Conclusion GPS provides reliable positioning, proper navigation and accurate timing services It offers various use of cost reduction, life saving, social networking, marketing, weather predicting and many more purposes As technology improves GPS becomes more reliable and error free

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