CYLINDER 5437314 - Caterpillar

The Global Positioning System (GPS)
GPS is a system of satellites that orbit the earth twice a day at very high altitudes. The orbit radius is approximately 26,600 km. GPS was set up by the United States government. GPS provides precise timing and positioning anywhere on earth, 24 hours per day with no charge to users.In very general terms, a GPS receiver computes its position based on radio signals received from several different satellites. The satellites have highly reliable clocks, so the timing of these satellite signals is known very accurately. The GPS receiver calculates the relative distance to each of the satellites. This calculation is based on the travel time of the signal and the speed of light (speed of the signal). The receiver then uses these distances