Error analysis for the Global Positioning System: Difference between revisions

Revision as of 20:10, 28 August 2011

Revision as of 21:39, 24 September 2011

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These problems tend to be very small, but may add up to a few meters (tens of feet) of inaccuracy.<ref>{{cite web |url=http://seismo.berkeley.edu/~battag/GAMITwrkshp/lecturenotes/unit1/unit1.html#3 |title=Unit 1 - Introduction to GPS}}</ref>

For very precise positioning (e.g., in [[geodesy]]), these effects can be eliminated by [[differential GPS]]: the simultaneous use of two or more receivers at several [[Benchmark (surveying)|survey points]]. In the 1990s when receivers were quite expensive, some methods of ''quasi-differential'' GPS were developed, using only ''one'' receiver but reoccupation of measuring points. At the TU Vienna the method was named ''qGPS'' and adequate software of post processing was developed.{{cn}}

== Geometric dilution of precision computation (GDOP) {{anchor|gdop}} ==