| http://www.w3.org/ns/prov#value | - BRIEF DESCRIPTION OF THE DRAWINGS Advantages of the present invention will be apparent from the following detailed description of exemplary embodiments thereof, which description should be considered in conjunction with the accompanying drawings, in which: FIG. 1 is a simplified model of a positioning system; FIG. 2 is a schematic diagram of a hybrid positioning system using GPS and/or DBS signal
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