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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.
== Geometric dilution of precision computation (GDOP) {{anchor|gdop}} ==
The concept of geometric dilution of precision was introduced in the section, ''error sources and analysis''. Computations were provided to show how PDOP was used and how it affected the receiver position error standard deviation.
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