On Wed, January 3, 2007 13:40, Stephan Sandenbergh said: > The datasheets mention <25m SEP (haven't got a clue what 'SEP' stands for) > positional accuracy. However, I am sure this is relative to the actual > datum. Does anyone know where I could find information on relative > positional accuracy within multi channel common view configurations?
GPS have strange error metrics, Spherical Error Probability, iirc is 50% of the 3d positions within a sphere with a radius (diameter?) of 25m. Maybe the metrics come from the military "background" of GPS. SEP says nothing about gaussian error distribution and 50% is even less than 1 sigma, whatever that says. Hmmm... with 25m position accuracy (and 100ns is about 30m), how do they really get time down to a few ns. Clever engineering! :-) -- Björn _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
