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Global Positioning System - GPSThe global positioning system is a location determination network that uses satellites to act as reference points for the calculation of position information. GPS is used extensively by the military and aircraft industry. GPS chipsets are now being incorporated into wireless devices, including phones, personal digital assistants (PDAs), and automotive applications. Each GPS satellite transmits two frequencies; 1575.42 MHz (the L1 carrier) and 1227.6 MHz (the L2 carrier). A GPS receiver compares the signals from multiple GPS satellites (4 satellite signals are usually used) to calculate a geographic position.
Global Positioning System (GPS) Operation
This figure shows a global positioning satellite (GPS) system. This diagram shows how a GPS receiver receives and compares the signals from orbiting GPS satellites to determine its geographic position. Using a precise timing signal based on a very accurate clock, the GPS receiver compares the signals from 3 or 4 satellites. Each satellite transmits its exact location, along with a timed reference signal. The GPS receiver can use these signals to determine its distance from each of the satellites. Once the position and distance of each satellite are known, the GPS receiver can calculate the position at which all of these distances cross. This is the location. This information can be displayed in latitude and longitude form or a computer device can use this information to display the position on a map on a computer display.
GPS Books
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GPS Quick Course Book
This book covers satellite position location technology and the GPS system has evolved. You will learn the functional parts of GPS systems, how they work and work together to provide position measurements that are accurate to within centimeters. $19.99 Printed, $16.99 eBook |
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