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Australia | In a sense the Network computers do create base virtual stations that are very close to the tractor as the tractor moves. The receiver in the tractor thinks it is getting its RTK data from a base station only a few feet away (not quite zero baseline I know but that's the term used). From memory, the VRS system only calculates new virtual stations when it needs to. Since all the CORS stations are accurately surveyed, the network always knows the position of the VRS so the tractor is always aware of its true position.
The VRS technique was first marketed by Trimble around 10 years ago, and is now supported as a legacy system by Leica SpiderNET. Trimble installs in some states, Leica does some too, and each company's equipment works on the others' networks... mostly ;)
The newest Network RTK technology is called MAX (Master AuXiliary) and works differently than VRS. New networks like Iowa DOT will support both. Old networks will get upgraded over time. Strongly recommend buying a MAX capable receiver for future purchases.
Hope this helps.
John | |
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Questions about Coors & cell phone differential service
