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Networks |
GPS--Global Positioning
Systems
On June 26,
1993 the U.S. Air Force launched the 24th Navstar satellite
into orbit, completing a network of 24 satellites known as
the Global Positioning System, or GPS. With a
Portable GPS receiver
that costs less than a few hundred dollars you can instantly
learn your location on the planet--your latitude, longitude,
and even altitude--to within a few hundred feet. |
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This incredible new technology
was made possible by a combination of scientific and
engineering advances, particularly development of the
world's most accurate timepieces: atomic clocks that are
precise to within a billionth of a second. The clocks were
created by physicists seeking answers to questions about the
nature of the universe, with no conception that their
technology would some day lead to a global system of
navigation. |
Four satellites are used
simultaneously to pinpoint the precise position of the
receiver on the earth. Information from the first three
satellites narrows down the range of possible locations to
two points; one of these is usually illogical and indicates
a point not on the earth. A fourth satellite is used to
confirm the target location (3).
The accuracy of a typical GPS receiver is about 10-15
meters. This may not be practical for locating a small
object such as an automobile, which is about three meters
long. Differential GPS (DGPS) is a system that improves the
accuracy of the GPS receiver to about one to two meters (4).
Several reference GPS receivers are placed at stationary
locations, whose coordinates are known. These receivers
compare their known locations to the location information
they receive from satellites, and broadcast the range errors
they detect from each other and from every satellite. A DGPS
receiver can pick up this range error information and
correlate it with the satellite signals it is receiving, to
find out its true position (5). The accuracy is dependent on
how fast the reference receivers broadcast their signals.
GPS Today
Today, GPS is
saving lives, helping society in countless other ways, and
generating 100,000 jobs in a multi-billion-dollar industry."
There is a very wide variety of GPS systems on the market
now at very affordable prices. No need to get lost trying to
get to your destination. Let the GPS guide you through. |
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Shop for Affordable
Portable GPS  systems
here.
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There is a
wide selection of
Portable GPS
 unit
here for you to peruse.
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$90 OFF! TomTom ONE-S Edition 3.5" Auto Navigation System Clamshell only $79.99 (was $169.99) after rebate
 |
