3 ms·
It's possibly not GPS achieving the centimetre accuracy, but a localised system, such as locata [1]. [1] http://locata.com/ http://locata.com/
by femto 13y ago
It's possibly not GPS achieving the centimetre accuracy, but a localised system, such as locata [1].
[1] http://locata.com/ http://locata.com/
- jacques_chester 13y agoI think they use local calibration. You have a GPS receiver at a known, surveyed point onsite. You compare the GPS placement to the actual location of the receiver, then use that difference for calculations being performed on other receivers.
- zeckalpha 13y agoThe military could be achieving that accuracy, though.
- jpalomaki 13y agoWikipedia article [1] states that differential GPS can provide up to 10cm accuracy. Differential GPS works by having a local GPS receiver station which location is well known. This station is comparing the location determined from the GPS signal to its known location, calculates necessary corrections and sends the information to other GPS receivers. [1] http://en.wikipedia.org/wiki/Differential_GPS http://en.wikipedia.org/wiki/Differential_GPS
- Game_Ender 13y agoYou are incorrect. It's quite possible to achieve sub 10 cm level accuracy with an RTK based GPS system [1]. The problem is that you have to install base stations to gather the corrections and then have the radio towers to distribute them. Since mining sites are fixed locations, it's pretty straight forward to setup up the needed infrastructure for an RTK system. [1] - http://en.wikipedia.org/wiki/Real_Time_Kinematic http://en.wikipedia.org/wiki/Real_Time_Kinematic