How does GPS work, what is geocaching?
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How does GPS work, what is geocaching?



GPS geocaching presentation 2006 during english course at Campus

GPS geocaching presentation 2006 during english course at Campus
answers you quickly the following questions:
how does GPS work? / what is geocaching?



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How does GPS work, what is geocaching? How does GPS work, what is geocaching? Presentation Transcript

  • GPS• history• functionality• accuracygeocaching• ?• equipment• conclusionthe journey
  • 1973 U.S. Air Force & Navy decided to develop asatellite navigation system.1974/79 System tests: Pseudolites and 11 Block I satellites1979 Decision to expand the GPS system to 24 satellites.1983 When a civilian airplane (Korean Airline) was shotdown after it had gone lost over Sovietterritory, it was decided to allow the civilian use of the GPS1989/94 replacement with improved Block II satellites1995 Full Operational Capability (FOC) is announced.2000 deactivation of the selective availability andtherefore improvement of the accuracy for civilians2005 Launch of the first 2R-M GPS-satellite.January 2006: 28 satellites (oldest one Feb. 1989)GPS - history
  • atomic clock2R-M assemblyLockheed Martin
  • 26.560 km from centre of earth- 6.360 km earth radius________20.200 km pathway-heightMEO - "medium earth orbit"GPS - functionalitytrue to scaleMonitor Stations - Hawaii
  • GPS - functionalityPosition DeterminationI am satellite X, myposition is Y and thisinformation was sentat time Z.distance
  • GPS - functionalityclock difference• Signals travel with the speed of light:c = 299 792 458,0 m/s• Time span between the satellite and thereceiver lies in the range of 0.07 sec.• A clock error of 1/100 second would lead toa mistake in the position of about?3000 km ! 2997924.58 m ;-)• To achieve an accuracy of 10 m of theposition, the runtime of the signal must beprecise to 0.00000003 seconds …
  • 1983GPS - accuracy2000 Galileo…2007100[m][year]520.01US Army …SA(Selective Availability)SAWAAS / EGNOSDGPS(Differential GPS)
  • geocaching - ?
  • geocaching - ?spoiler! :-/
  • geocaching - ?Implosion Meteorsolarthermienator-cachenote
  • geocaching - ?cache content• Log-book• Pencil• Cachenote• Trade stuff• Deed of FTF
  • ….geocaching.comLog our visit!
  • geocaching - equipment=> GPSr• Compass• Map• Cache Bag• PDA• Location• Stuff to Stash (trade)• Container (waterproof)• Micro-caches• Hiking Staff• special equipment like:scuba gear, things for climbing …
  • geocaching - conclusion• Find places you’ve never beenor recognised before.• Do outdoor sports with amission in background.• Enjoy the beautiful nature ...... and protect her!
  • chief source of informationGlobal Positioning System: and Art: