navigation and time

navigation and time - Ian Tierson 4/9/2008 Dr. Karim...

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Ian Tierson 5/12/2009 Dr. Karim Navigation and Time Time has always been a crucial factor in navigation. Today, with the modern navigational tool the GPS, or Global Positioning System, time is still utilized in delivering an accurate location on the globe. The GPS began as a military technology, but has been newly introduced to private consumers for personal use. The GPS works on a simple network of satellites where each orbits the earth twice a day. There are six distinct orbital patterns, and each pattern has four satellites. This results in 24 satellites providing global coverage 24 hours a day. Only 21 of these satellites are used, the remaining are redundancies to be used in the event of a failure of one of the satellites currently in operation. The GPS requires three separate satellites to triangulate a two dimensional image of the unit’s position, and with four or more satellites, a three dimensional image can be rendered.
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A GPS uses time differences to calculate locations. Each of the satellites orbiting the earth has an onboard clock that keeps time. At a specific time each day, all of the satellites begin transmitting a pseudo-random code that is received by a GPS unit on the ground. The receiver unit also begins the same code at the same time as the satellites. The GPS unit takes the data from at least three
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navigation and time - Ian Tierson 4/9/2008 Dr. Karim...

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