I'm sure almost everyone on this planet belongs to the Global Positioning System or GPS. But how many people really know how they work? This is a brief summary of how GPS works.
Satellites
Gps Map Updates
GPS systems through a network of more than 50 satellites covering the globe, and then run the GPS system. To find the location of a GPS signal, at least three satellites are able to receive the signalthat is transmitted. Then compare these satellites, so to speak, and then triangulate the position.
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*** Product Information and Prices Stored: Aug 23, 2011 03:44:28
A GPS device to send a message with the date of transmission of a radio signal to the satellite overhead. The satellites, which receives this signal, compare the time that the signal was sent at the time of their atomic clocks. From there it will be the amount of time it takes for them to determine in order to receive the signal, then compare the amountthe time taken for each satellite in order to signal their location and this information, as the location to receive the signal from the source.
Possible problems with GPS units
I'm sure you suspect that the accuracy of a GPS unit depends on the chunk of time in the device that sends the signal. If the GPS time is off, can affect the accuracy of positioning information. Clock errorare a number of inaccurate information in GPS devices. The most important source of inaccurate information from the atmosphere. When the signal might penetrate through the atmosphere for satellites may occur, is that to speed up or slow down, so as to affect the time and the calculations are given.
Inaccuracies occur when a signal bounces off a skyscraper, like mountains or other reasons. This will then lead to distortions, which are similarthose caused by weather conditions. Another problem occurs when the satellite updates its position, it is done every 12 minutes. When a signal is a satellite comes close to its update time, the satellite does not know the correct position, and makes a calculation based on bad information. These types of errors are inevitable with GPS systems that are sold to consumers. But for most applications, these problems are not a lot.
The problems with GPS units
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