24 GPS satellites carry atomic clocks

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SUMMARY

The discussion centers on the functionality of the 24 GPS satellites, which utilize atomic clocks to achieve high precision in location measurement. By employing trilateration, the GPS system determines a user's position based on the intersection of three spheres generated by satellite signals. The correct intersection point is identified by eliminating the option that does not lie on the Earth's surface, ensuring accurate positioning.

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  • Understanding of trilateration principles
  • Familiarity with GPS technology
  • Knowledge of atomic clock functionality
  • Basic concepts of satellite communication
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  • Research the principles of trilateration in GPS systems
  • Explore the technology behind atomic clocks used in satellites
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This discussion is beneficial for aerospace engineers, GPS technology developers, and anyone interested in the mechanics of satellite navigation systems.

PPonte
Quoted from http://hyperphysics.phy-astr.gsu.edu/hbase/gps.html#c1"

Adding a third as in the GPS system locates it at one of two discrete points where the three spheres intersect. The correct one is easily chosen to get a precise location. The 24 GPS satellites carry atomic clocks to give them the accuracy necessary for position measurement.

How do they know which of the points is the correct one? (see sentence in blod)

Thank you!:approve:
 
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I took a guess that one of the points doesn't lie on surface the Earth, and it seems that I was partially correct - see http://www.trimble.com/gps/how.html" .
 
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