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bargl
on July 16, 2014
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GPS and Relativity
That's part of what the 4th connected satellite does. Also this is one of the better descriptions of trilateration I've seen.
http://gis.stackexchange.com/questions/12866/why-does-gps-po...
nly
on July 17, 2014
[–]
Andrew Holme explains a some of these things succinctly on his home made GPS receiver project page[0]. Search for "Solving for user position", where he even mentions ionospheric propagation. He also has an appendix showing his math[1]
[0]
http://www.aholme.co.uk/GPS/Main.htm
[1]
http://www.aholme.co.uk/GPS/user_position_solution.pdf
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