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GPS-in Nutshell

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  1. 1. What’s it? • It is a Space based satellite navigation system. • Provides : location and time information in all weather conditions. • Maintained by the United States government • Accessible to anyone with a GPS Receiver.
  2. 2. History: • On June 26, 1993, the U.S. Air Force launched the 24th NAVSTAR Satellite into orbit. • The network of 24 satellites known as GPS. • Roger L . Easton is widely credited as the primary inventor of GPS. • It became fully operational in 1994.
  3. 3. Types of GPS: • They vary according to our need. Major types: • GPS Navigators • Hand-held GPS • GPS Trackers • Emergency GPS
  4. 4.  It consist of three segments.  Space Segment  Control Segment  User Segment  Calculate :  three-dimensional Location  the current time.
  5. 5. Segment description: • Space segment: Composed of satellites. Constellation refers to “set of satellites” NAVSTAR composed of 24 satellites. Function : Transmit signal from space on the basis of which the time and position of the user is measured.
  6. 6. • Control Segment: Holds:  5 ground based monitor station  3 antennas  a master control station Function: Monitor station  master controller Antenna  GPS receiver
  7. 7. User Segment: • Holds: GPS Receiver User community • Function: Converts SV Signals into Position , time, velocity.
  8. 8. Working: Basically working holds three task as follows: • The GPS transmits signals from the satellites down to earth. • GPS Receiver then analyzes the data that was received. • Then uses the mathematical concept of triangulation to compute the exact location of the user.
  9. 9. Accuracy: It depends upon the types of receiver. Most hand-held GPS units have about 10-20 meter accuracy. Differential GPS (DGPS) obtains much higher accuracy. As recorded by the roving units, producing an accuracy greater than 1 meter.
  10. 10. Advantages: Easy to navigate GPS works in all weather. 100% coverage on the planet. Easy to integrate into other technologies like Cell phone. Best navigating system in water.
  11. 11. Disadvantage: GPS signals are not accurate due to some obstacles to the signals. Atmospheric conditions such as geomagnetic storms makes it not accurate. If GPS on a battery operated device, there may be a battery failure we need an external power supply which is not always possible
  12. 12. GPS Application: • Google Earth is the most famous application that uses the signals received by the GPS receivers. • United States and European countries show a rapid growth in using GPS for the car navigations and the number of GPS equipped mobile phone usage.
  13. 13. Some Application: • DeLorme Street Atlas 2010 • Gramin nRoute • Top Grossing Apps on iTunes • LOCiMOBILE Apps for tracking people • GPS Tracking Lite v2.0
  14. 14. Recent Development: Block IIA: – upgraded version of the GPS Block II satellites. – Developed by Rockwell International – As of November 2012, there were 9 Block IIA satellites. GPS Block IIR: -"R" in Block IIR stands for replenishment. -Developed by Lockheed Martin -As of November 2012, there were 12 IIR satellites
  15. 15. Current development: GPS Block III: • development by Lockheed Martin • GPS III will provide more powerful signals in addition to enhanced signal reliability, accuracy, and integrity. • GPS III series is the newest block of GPS satellites
  16. 16. Future of GPS: The future will hold a lot more surprises. Automobiles are tested on moving on their own without the assistance of a driver. Tests have begun in using unmanned aircrafts. The green plant density of a certain area can be calculated or estimated.
  17. 17. Conclusion: • GPS has truly helped man to advance in more ways than one. • It is also going to bring a great revolution by its development.
  18. 18. Presented by, I.Madhumithah, I M.Sc(CS)., G.Venkataswamy Naidu College, Kovilpatti.
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