Definition

A parameter relating the precision of the position (and/or an unknown auxiliary) provided by a positioning system to that of the "observed quantities" directly measured by the system. DOP is a measure of the influence of the geometry of loci on the precision of position fixing. DOP is frequently used with a qualifying term such as geometric (GDOP), horizontal (HDOP), vertical (VDOP) etc. to indicate that DOP is related to all or some unknown quantities.