On 24 May 2011 20:52, wrote: >> > "RP should take a look at the Leica GPS surveying gear =A0- they are >> > quoting sub-mm rms resolutions and accuracies based on differential >> > techniques.." >> >> I wonder how long to take a measurement of that resolution. Presumably >> there's a sqrt(Hz) term. > > I always thought they did it by having access to the high resolution GPS = signal. > -- > Scanned by iCritical. > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > Looks like the survey receivers.are a bit more different than I thought Carrier phase measurements seem to be limited to about 1% of the period, which works out to ~2mm or so. Leica are quoting 0.2mm accuracy so they must be doing something special. Or I may be misinterpreting the spec. I'll just have to try and find out more about what's going on! RP --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .