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GPS

GPS. Global Positioning System By Jeff Anderson. What is GPS?. The Global Positioning System (GPS) is actually a constellation of 27 Earth-orbiting satellites (24 in operation and three extras in case one fails).

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GPS

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  1. GPS Global Positioning System By Jeff Anderson

  2. What is GPS? • The Global Positioning System (GPS) is actually a constellation of 27 Earth-orbiting satellites (24 in operation and three extras in case one fails). • The U.S. military developed and implemented this satellite network as a military navigation system.

  3. How It Works • A GPS receiver's job is to locate four or more of these satellites, figure out the distance to each, and use this information to deduce its own location. • This operation is based on a simple mathematical principle called trilateration.

  4. How It Works • In order to make this simple calculation, the GPS receiver has to know two things: * The location of at least three satellites above you * The distance between you and each of those satellites

  5. How It Works • The GPS receiver figures both of these things out by analyzing high-frequency, low-power radio signals from the GPS satellites. Better units have multiple receivers, so they can pick up signals from several satellites simultaneously.

  6. 3D Trilateration http://adventure.howstuffworks.com/gps2.htm

  7. APPLICATIONS • Timing • Roads and Highways • Space • Aviation • Agriculture • Surveying and Mapping • Marine • Rail • Environment • Public Safety • Disaster Relief • Recreation

  8. Timing • Each GPS satellite contains multiple atomic clocks that contribute very precise time data to the GPS signals. GPS receivers decode these signals, effectively synchronizing each receiver to the atomic clocks. This enables users to determine the time to within 100 billionths of a second, without the cost of owning and operating atomic clocks.

  9. Timing • New applications of GPS timing technology appear every day. Hollywood studios are incorporating GPS in their movie slates, allowing for unparalleled control of audio and video data, as well as multi-camera sequencing. • The ultimate applications for GPS are limitless.

  10. Agriculture • The development and implementation of precision agriculture or site-specific farming has been made possible by combining the Global Positioning System (GPS) and geographic information systems (GIS). • GPS-based applications in precision farming are being used for farm planning, field mapping, soil sampling, tractor guidance, crop scouting, variable rate applications, and yield mapping.

  11. Tractor Guidance (Old Way)

  12. Tractor Guidance (New Way)

  13. Surveying • The new Magellan® ProMark 500 offers GPS+GLONASS+20 years of field-proven technologies for surveying and geodesy. Magellan’s latest RTK survey solution delivers state-of-the art GNSS in a smart, compact, light and cable-free design that gives you maximum mobility and flexibility in the field.

  14. Disaster Relief • A critical component of any successful rescue operation is time. Knowing the precise location of landmarks, streets, buildings, emergency service resources, and disaster relief sites reduces that time -- and saves lives.

  15. Disaster Relief • To contain and manage forest fires, aircraft combine GPS with infrared scanners to identify fire boundaries and “hot spots.” Within minutes, fire maps are transmitted to a portable field computer at the firefighters’ camp. Armed with this information, firefighters have a greater chance of winning the battle against the blaze.

  16. Disaster Relief • In earthquake prone areas such as the Pacific Rim, GPS is playing an increasingly prominent role in helping scientists to anticipate earthquakes. Using the precise position information provided by GPS, scientists can study how strain builds up slowly over time in an attempt to characterize, and in the future perhaps anticipate, earthquakes.

  17. Disaster Relief • Meteorologists responsible for storm tracking and flood prediction also rely on GPS. They can assess water vapor content by analyzing transmissions of GPS data through the atmosphere.

  18. Public Safety • Outdoor exploration carries with it many intrinsic dangers, one of the most important of which is the potential for getting lost in unfamiliar or unsafe territory. Hikers, bicyclists, and outdoor adventurers are increasingly relying on GPS instead of traditional paper maps, compasses, or landmarks.

  19. Recreation • Golfers use GPS to measure precise distances within the course and improve their game.

  20. Recreation • GPS technology has generated entirely new sports and outdoor activities. An example of this is geocaching, a sport which rolls a pleasurable day’s outing and a treasure hunt into one. Another new sport is geodashing, a cross-country race to a predefined GPS coordinate.

  21. For Your Car • If you don't like reading directions, you'll love the Magellan Maestro vehicle navigation system! It's simple to use and ready to guide you to virtually any destination. The thin, sophisticated design and attractive, intuitive touch-screen graphics make driving a pleasure. Enter an address or select from preprogrammed points of interest with a few touches of the screen. See your position and route on the 2D or 3D map and let Maestro's friendly voice guide you turn-by-turn, while you enjoy the drive.

  22. For Your Car

  23. Handheld • Amazingly easy to use, it's the next-generation handheld GPS for precision outdoor navigation. Large, full-color display shows maps and data with crystal clear graphics. Rugged and waterproof.

  24. Bibliography • http://www.howstuffworks.com/gps.htm • http://www.gps.gov/index.html • http://www.standen.co.uk/cms/cache/HERRIAU/750x400_s2_IMGP0162b.jpg • http://www.sprayparts4less.com/catalog/gpsart.JPG • http://www.magellangps.com/

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