Gollnick
Musical Director
- Joined
- Mar 22, 1999
- Messages
- 29,258
I have worked with surveryors who use a GPS system that's accurate to within a few centimeters. They do it by setting up their own base station, a large trailer with a giant antenna, probably 40' or higher. The field surveyors use backpack-based GPS units. I don't know what a complete setup like that costs, but a single backpack is about $14,000.
This is a form of DGPS. The trailer thing gets the corrections probably from several local DGPS stations (hence the big antenna), and shared them with local users. And that backpack full of electronics and associated batteries is necessary for the rather powerful computer that's doing all the math. This stuff gets really computationally intensive really fast.