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GPS, Why, What and How

GPS, Why, What and How. Where am I?. Valco Shopping Center. You are here. Classical Navigation Methods. Celestial Navigation. Landmarks. Dead Reckon. Looser!!!. Christopher Columbus got lost!!!!. 24/7 Anywhere, Always!!. “Surgical” Military Strike. 1957 Sputnik.

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GPS, Why, What and How

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  1. GPS, Why, What and How

  2. Where am I? Valco Shopping Center You are here

  3. Classical Navigation Methods Celestial Navigation Landmarks Dead Reckon

  4. Looser!!! Christopher Columbus got lost!!!!

  5. 24/7 Anywhere, Always!! “Surgical” Military Strike 1957 Sputnik • Precision Navigation 24/7 • All kinds of weather • Anywhere on the earth • Premium military access • World wide civilian access

  6. 0°0’0”N, 0°0’0”E Greenwich, England Degrees Minutes Seconds prime meridian

  7. The Three GPS Segments

  8. Satellites, Launch Vehicles Block II Block IIA -10 Block IIR -12 Atlas E VBAFB Block IIRM -7 Block IIF -2 Delta II CCAFB

  9. Atomic Clock • Most Accurate Time Source Devised by man. • 1 Second Drift every 100,000 years • All Satellites are Time Synchronized • GPS time is accurate to within 14ns * * *

  10. Space Segment Facts • GPS Satellites Orbit at about 11,000 miles high • All Satellites circle the earth twice a day. • 31 Active Satellites • 36 Orbit Slots • Decommissioned & Spare Satellites • 2 Watt Transmitters

  11. Kepler’s Laws, Planetary Motion • All orbits are elliptical • All orbits are periodic • Orbiting bodies move faster when closer to planet/sun.

  12. Control Segment- Master Control Master Control Station 2nd Space Operations Squadron (2SOPS) Shreiver AFB Base, Colorado Springs, CO.

  13. GPS Control Segment Global Ground Network Cape Canaveral Ascension Diego Garcia Kwajalein Ground Antennas

  14. Control Segment • Global Ground Network • Master Control Station • Track GPS Satellites • Monitor Satellite Transmissions • Perform Analyses • Monitor Solar Activity • Send Corrective Commands to Satellites. • Ensures Accurate GPS signals 24/7

  15. User Segment Surveying Rail Roads - PTC Yachting Fleet Vehicle Management Disaster Mapping - GeoTag Joe Hiker

  16. How ? - Lost Hiker Landmark 2 (XLM2,YLM2) Landmark 1 Landmark 3 (XLM1,YLM1) (XLM3,YLM3) Lost Hiker (xLH,yLH)

  17. Lost Hiker, Cont. Landmark 2 (XLM2,YLM2) Landmark 1 Landmark 3 (XLM1,YLM1) (XLM3,YLM3) Lost Hiker (xLH,yLH)

  18. Intersection of Spheres

  19. Measuring the distance to a Satellite Satellite Pseudo Random Code GPS Satellite Receiver Pseudo Random Code GPS Receiver Distance = (Speed of Light) * Time Speed of Light = 186,000 miles/sec

  20. Ionosphere & Tropshpere

  21. Chabot College Parking Lot 37° 38’ 34.38” N 122° 06’ 18.48” W Typical Accuracy 5m–6m Worst Case 20M

  22. CDMA Cell Phone Contacts

  23. GPS time – Cell Tower

  24. First John Deere Tractor 1923

  25. 2012 “Fully Load” John Deere • Inertial Navigation • Precision Lasers • GPS Navigation • “Hands Free” Ops • Air Conditioning

  26. Modern Tractor Cabin

  27. “Connected Farming” GPS “Psuedolite” Differential GPS

  28. Prescription Map – Pests,Weeds Host Controller

  29. Good Clean Tractor Fun

  30. JPALS, Aircraft Carrier Landings

  31. Engineering Disciplines • Electrical Engineers • Ceramic Engineering • Mechanical Engineers • Civil Engineers • Computer Engineering • Environmental Engineering • Fire Protection Engineering • Chemical Engineers • Materials Engineering • Software Engineers • Logistical Engineers • Aeronautical Engineers • Process Engineers • You Name It Engineers

  32. Q & A

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