GLONASSARY

VRS (Virtual Reference Station) – Represents a network correction method in which multiple base stations are used to derive correction data specific to an individual rover but it is unique in that a “virtual” base station is created for the rover at the autonomous point of initiation. This method of network GPS/GNSS correction is proprietary to Trimble™. The rover uses correction data from this VRS as if it were working off of a “real” station. However, the correction algorithms received from the VRS more closely model the error experienced by the rover than a “real” station’s single baseline solution from some miles away. This correction approach can allow for increased accuracy and reliability for RTK and similar based systems. The reliability comes into play when considering the multiple base stations used as opposed to a single baseline solution. With a VRS, the operator has multiple stations from which data is being pulled; however, a single baseline solution is dependent upon the “health” of one station. Because the VRS has the ability to seamlessly pick up or select another base station in the event one of its base stations goes down during the receiver operation, it lends itself to continuous operation and is not dependent on any one station’s functionality.

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