Global position system

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Global position system

  1. 1. Global Position System<br />By HengYu Lou<br />
  2. 2. Video<br />
  3. 3. History<br />DOD (U.S. Department of Defense)<br />1978 to 1979 four GPS satellite<br />1979 to 1984 seven GPS satellite named BLOCK I<br />1993 21+3 GPS satellite is in space <br />The Global Position System is finally finish <br />
  4. 4. System<br />GEO (Geocentric Orbit) 22,369 mile<br />MEO (Medium Earth Orbit) between GEO and LEO<br />LEO (Low Earth Orbit) 1,243 mile<br />GPS 12,552 mile<br />21+3 <br />1 Maine station<br />4 Ground Antenna<br />6 Monitor Station<br />
  5. 5. Usage<br />Construction<br />Alarm system<br />Navigation<br />Weapon<br />Car<br />Boat<br />Airplane<br />
  6. 6. military<br />GPS was build for military<br />SPS (standard positioning service)<br />PPS (Precise Positioning Service)<br />SA (Selective Availability) 100 meter<br />After 2000 cancel SA to 10 meter<br />
  7. 7. Pro<br />No weather effect<br />Cover 98 percent of globe<br />Three dimensions accuracy<br />Fast<br />Many usage<br />Moveable <br />
  8. 8. Con<br />24 satellites not enough<br />Need at least three to work<br />Not workable underground like tunnel<br />
  9. 9. Question?<br />
  10. 10. The End<br />

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