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The Global Positioning System and HP SmartClock

The Global Positioning System, or GPS, was designed as a ranging system that uses known positions of satellites in space to determine unknown positions on land, on the sea, in the air, and in space. GPS is a passive system in which each satellite transmits its position and the time of the position message. No information about the user or the user’s receiver is required for a determination of the user’s instantaneous position and velocity (navigational use) or for determining time at the user’s receiver (time transfer use).