Global Positioning System

4773 words, 20 pages

Intro Sample...


As shown in figure, linking 24 satellites makes GPS work.

Fig.1 Constellation of 24 Satellites So how does someone “buy” a GPS? Usually when someone refers to their “GPS” what they are really talking about is a GPS receiver. GPS receivers are small devices that, as the name implies, receive signals from the GPS network of satellites and provide location and other data. Through a process call Triangulation, they are able to determine the exact location by locking onto the positions of 4 (or more) satellites.

CITC (CE DEPT.)

2

GLOBAL POSITIONING SYSTEM (GPS)

The satellites broadcast their positions and the GPS receivers pick their signal and then make the necessary calculations. Sometimes, you will hear the term GPSr (GPS Receiver), but in most cases, it’s just GPS . If you want to know exactly where you are at any time (within an acceptable range of a few feet), a GPS receiver is your tool. GPS can do other things as well. Most GPS systems have a built-in Trip Odometer for instance. Other common features are Sunrise / Moonrise time tables, Altimeters, and Ma p features. Combined with a transmitting device, GPS can also perform locator services. So you can see that GPS is more than a toy; if it matters at all where you are, where you are going, or even where you have been, GPS is your tool. A typical handheld GPS receiver is slightly larger than a standard cellular phone. Like this model (below), GPS receivers are designed to fit in your hand as well as a pocket or purse. They can be taken anywhere.

Fig.2 GPS receivers CITC (CE DEPT.) 3

GLOBAL POSITIONING SYSTEM (GPS)

2.0 FUNCTIONALITY :
The entire GPS system actually consists of 3 “segments”. The first and most important is the Space Segment. That segment consists o f the 24 earth-orbiting satellites. The second segment, the Control Segment, consists of 5 ground based stations. As the name implies, the View More »

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