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#11
December 15th 06, 06:25 AM
posted to rec.aviation.piloting
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GPS Error: Vertical vs. Horizontal
"peter" wrote in message
oups.com... Travis Marlatte wrote: "Ron Lee" wrote in message ... Actually the DOPs are related to satellite geometry and are unitless. It is only when you multiply the DOP by the signal/user equipment error that you get some sort of error in feet/meters. The DOPs represent a statistical confidence. They do have a unit but you're right, it's not in units of distance and it is not standardized. No, Ron is correct that the various DOPs (PDOP, VDOP, HDOP, TDOP, etc.) are unit-less measures based on the satellite geometry. They are well-defined and standardized as specified in Section 3.1.3 of the Navstar User Equipment guide: http://www.navcen.uscg.gov/pubs/gps/gpsuser/gpsuser.pdf I agree. I overstated my point which was only that the DOPs did not represent something as simple as an error radius around the true position. ------------------------------- Travis Lake N3094P PWK 
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