class 17: introduction to navstar gps 19 march 2007
TRANSCRIPT
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Class 17: Introduction to NAVSTAR GPS
19 March 2007
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Topics for today• Exam Review
• Deadline for article reviews 6 April 2007
• Some relevant history
• System components– Space– Ground– User
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Brahe and Kepler
1546-1601
1571-1630
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Kepler’s Laws1. Planetary orbits are elliptical with Sun as one focus.
2. Due to 1 planetary velocities vary. But sweep equal area in equal time.
3. The ratio of the squares of the revolutionary periods for two planets is equal to the ratio of the cubes of their semi-major axes.
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Yet more graphics
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Post WW-II Radio Navigation
• LORAN
• SHORAN
• OMEGA (ended 1997)
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Federal Radionavigation Plan
• http://www.navcen.uscg.gov/pubs/frp2005/2005%20FRP%20WEB.pdf
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Doppler
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Early SatNav Systems
Transit on left, Timation on right
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Radio Navigation
http://www.thespacereview.com/article/626/1
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Six Planes/Five Slots
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Broadcast Ephemeris Message
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GPS Block IIR
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Resources
• http://www.colorado.edu/geography/gcraft/notes/gps/gps_f.html
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Observation File
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SP3 Precise Orbit file
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Position for TXSN
Between 1997 and May 2006 the position of this site changed by 0.143 m!
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WHAT???????