Active control networks and Trimble VRS
Butler, Bruce
Powerpoint presentation.
Focusing on the take up of Trimble active control networks by mapping agencies around the World, the presentation highlighted some national differences in approach together with global atmospheric and geodetic considerations. In Switzerland, for example, the GPS/GLONASS network is state owned and operated. Tropospheric modelling is challenging due to large elevation changes, and an underlying model is used to transform virtual reference station coordinates into the local Swiss reference frame. The GPS/GLONASS networks of Finland and Denmark, by contrast, are privately owned and operated. The Finnish NMO pays for use of the national network, and in Denmark there is strong cooperation between the network provider and the NMO (KMS) who assist with monitoring the coordinates of reference stations. Sweden has an extensive GPS/GLONASS network which is state owned and operated and used, for example, by municipalities. In Great Britain there is a nationwide state owned GPS network with four GPS/GLONASS stations covering London. Data from the network is used for a commercial RTK subscription service operated by partners. Use of Virtual Reference Stations (VRS) increase RTK availability and reliability, as compared to single reference station use. A virtual reference station has no multipath. Use of GPS together with GLONASS increases availability and reliability over use of GPS only.
Event: Expanding horizons in a shrinking world
Only personal, non-commercial use of this document is allowed.