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  1. 1. Global Positioning System Presented by : Trupti Kole
  2. 2. Introduction : The Global Positioning System (GPS) is a satellite-based navigation system , made up of a network of 24 satellites placed into orbit In 1980s, it was developed by the United States Department of Defense, and it is officially named NAVSTAR GPS GPS works in any weather conditions, anywhere in the world, 24 hours a day. There are no subscription fees or setup charges to use GPS.
  3. 3. How GPS Work The Global Positioning System (GPS) is actually a constellation of 27 Earth-orbiting satellites GPS satellites circle the earth twice a day in a very precise orbit and transmit signal information to earth. GPS receivers take this information and use triangulation to calculate the user's exact location. Essentially, the GPS receiver compares the time a signal was transmitted by a satellite with the time it was received. The time difference tells the GPS receiver how far away the satellite is.
  4. 4. GPS Signals
  5. 5. What's the signal? 1. GPS satellites transmit two low power radio signals, designated L1 and L2. 2. Civilian GPS uses the L1 frequency of 1575.42 MHz in the UHF band. 3. The signals travel by line of sight, meaning they will pass through clouds, glass and plastic but will not go through most solid objects such as buildings and mountains.
  6. 6. What's the signal? A GPS signal contains three different bits of information :-  A pseudorandom code  Ephemeris data  Almanac data.
  7. 7. What's the signal? 1. The pseudorandom code is simply an I.D. code that identifies which satellite is transmitting information. 2. Each satellite transmits ephemeris data showing the orbital information for that satellite and for every other satellite in the system. 3. Almanac data, which is constantly transmitted by each satellite, contains important information about the status of the satellite (healthy or unhealthy), current date and time. This part of the signal is essential for determining a position.
  8. 8. Sources of GPS signal errors 1. Ionosphere and troposphere delays 2. Signal multipath 3. Number of satellites visible 4. Orbital errors 5. Receiver clock errors
  9. 9. Elements of GPS
  10. 10. Elements of GPS : GPS has three parts :-  The space segment  The user segment  The control segment.
  11. 11. Elements of GPS : A Constellation of Satellites To make this measurement as accurate as possible, the GPS navigation signals are specially designed to make it easy for GPS receivers to measure the time of arrival and to allow all the satellites to operate on the same frequency without interfering with each other. Receivers GPS receivers can be carried in your hand or be installed on aircraft, ships, tanks, submarines, cars, and trucks. These receivers detect, decode, and process GPS satellite signals. More than 100 different receiver models are already in use
  12. 12. The GPS satellite system 1. The 24 satellites that make up the GPS space segment are orbiting the earth about 12,000 miles above us 2. They are constantly moving, making two complete orbits in less than 24 hours. 3. These satellites are travelling at speeds of roughly 7,000 miles an hour.
  13. 13. The GPS satellite system GPS satellites are powered by solar energy. They have backup batteries onboard to keep them running in the event of a solar eclipse, when there's no solar power. Small rocket boosters on each satellite keep them flying in the correct path.
  14. 14. Best GPS Technology available in Market Garmin 880 Bluetooth Automotive GPS System w/ MSN Direct & Voice Recognition The Garmin nüvi 880 features a 4.3-inch, 480-by-272- pixel, WQVGA resolution screen. There's built-in support for Microsoft's MSN Direct service. You also get a music player, an Audible audiobook player, and a picture viewer.
  15. 15. Microsoft Streets and Trips 2008 with GPS Locator DVD The #1 best-selling travel and map software A sleek Global Positioning System (GPS) receiver that connects through your computer’s USB port. With Streets & Trips 2008 with GPS Locator, you'll always know exactly where you are. Map your trip, plug the GPS receiver into your laptop, and go!
  16. 16. All-in-one mobile PC with Microsoft Windows XP operating system and built-in 12-channel GPS 7" WVGA high-resolution LCD touch-screen display; Virtual keyboard makes it easy to access settings and functions, type e-mails and take notes Preloaded Navteq base maps of the U.S. and Canada Built-in wireless LAN (802.11) and 10/100 Mbps Ethernet connectivity keeps you connected to the Web for quick access to Web browsing, e-mail, streaming media and downloads Jensen 7 Windows XP PRS Mini-Computer PC With GPS and WiFi
  17. 17. Uses and Advantages
  18. 18. The Practical Uses of Global Positioning Systems Personal Emergencies : GPS equipped cell phones can transmit precise locations to 911 dispatchers. This allows the dispatcher to have an immediate and accurate location instead of relying upon descriptions of people who may be unfamiliar with the area or too distraught to explain their location. The same technology has also helped catch people who make crank 911 calls from their GPS-enabled cell phone.
  19. 19. The Practical Uses of Global Positioning Systems Recreational Uses : GPS is popular among hikers, hunters, snowmobilers, mountain bikers, and cross- country skiers. rails can be viewed on topographic map software, traced on the screen and that route can be downloaded into the GPS. Tracking Your Kids: : GPS-enabled cell phones can be used to monitor your kids.
  20. 20. Laptop GPS: Laptop GPS receivers turn any mobile computer into a fully functional GPS System. Save money and use a laptop GPS receiver for in-vehicle, office based meetings to track locations and find directions or simply to plan a cycle ride for the next day.
  21. 21. Advantages of GPS technology 1. No More Maps by the Dozen! 2. Safer roads? 3. Money Saving 4. Less traffic?
  22. 22. Thank you