It seems that almost all the dashboard of the car has a GPS receiver perched on top. They have become incredibly popular as a navigation tool with many people from rely on them exclusively to his work is about the road network.
The Global Positioning System has been around for a few years, but was originally designed and built for U.S. military applications, but was extended to civilian use following an air disaster.
While it is incredibly useful and convenient tool, GPS systems is relatively simple in its operation. The navigation works by using a constellation of 30 satellites more or less (there are a few more that are in orbit but no longer operating).
The signals sent from satellites contains three pieces of information that are received by the SAT navigation devices in our cars.
That information includes:
* The time the message was sent
* The satellite's orbital position (known as the ephemeris)
* The health system in general and the GPS satellite orbits (known as the almanac)
The way in which navigation information is developed is the use of information from four satellites. The time signals from the left each of the satellites is recorded by the satellite receiver, navigation and distance to each satellite is then developed using this information. By using information from four satellites is possible to know exactly where the satellite receiver, a process known as triangulation.
Without But exactly where you are in the world is based on the total accuracy in the time signals emitted by satellites. As these signals as GPS travel speed of light km (about 300,000 per second through a vacuum), even a second inaccuracy could see the positioning information for 300 miles! Currently, the GPS system has an accuracy of five meters and shows how accurate the information disseminated by the time satellites.
This high level of accuracy is possible because each GPS satellite contains atomic clocks. Atomic clocks are incredibly accurate based on the oscillations of atoms to keep time unbreakable - in fact, each GPS satellite has a duration of more a million years before drifting as much as a second (compared to the average electronic clock that is derived from a second in a week or two)
Due to this high level of accuracy of atomic clocks on board GPS satellites can be used as a source of accurate time synchronization for computer networks and other devices that require synchronization.
Receiving the time signal requires the use of an NTP GPS server that is synchronized with the satellite and allocate time for all devices on a network.
About the Author:
Richard N Williams is a technical author and specialist in atomic clocks, telecommunications, NTP and network time synchronisation helping to develop dedicated NTP clocks. Please visit us for more information about an NTP server or other NTP time server solution.
Article Source: ArticlesBase.com - GPS Atomic Clock Time Signals
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