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Adams,MN | Single base RTK actively and dynamically measures GNSS measurement errors, mostly satellite orbit,troposphere and ionosphere errors. In single reference station RTK, the errors are assumed to be constant everywhere around the reference station. In reality however,because the errors are not constant,the quality of the error estimates degrade as a function of distance and can reach an unacceptable level for ambiguity resolution after a few miles.
The solution to this problem is multiple reference station RTK. Instead of choosing the solution from one reference station or another,the multiple reference station solution allows users to combine the estimated measurement errors at each of the reference stations and make a smooth transition of the errors from one station to another.
Virtual reference station (VRS). VRS corrections are the single reference station corrections that have been mathematically translated to a virtual geographic location that is closer to the users location. This location change moves the reference station to a distance that is more representative for the new level of measurement error after applying the network error model. It is basically putting a tower in the field with you every time you log onto the system.
http://www.insidegnss.com/auto/julyaug08-gnss-sol.pdf
Edited by CLLEWISON 9/8/2008 21:40
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Why VRS is better then single base RTK....
