Global Positioning Systems and Applications
(from wikipedia) The primary military purpose is to allow improved command
and control of forces through an enhanced ability to accurately specify
target locations for cruise
missiles or troops. The satellites
also carry nuclear detonation detectors, which form a major portion of the United
States Nuclear Detonation Detection System.
The system is used by countless civilians as well, who can use the
GPS's Standard Positioning Service worldwide free of charge. Low
cost GPS receivers (price $100 to $200) are widely available, combined
in a bundle with a PDA or car computer.The system is used as a navigation
aid in aeroplanes, ships and cars. The system can be used by computer
controlled harvesters, mine trucks and other vehicles. Hand held
devices are used by mountain climbers and hikers. Glider pilots use
the logged signal to verify their arrival at turnpoints in competitions.
On May 1, 2000, US President Bill Clinton announced that this "Selective
Availability" would be turned off. However, for military
purposes, "Selective Deniability" may still be
used to, in effect, jam civilian GPS units in a war zone or global
alert while still allowing military units to have full functionality.
European concern about this and commercial issues has resulted
in the planned GALILEO positioning system. Russia already operates
an independent system called GLONASS (global navigation system),
although with only 12 active satellites as of 2004 the system is
of limited usefulness.
Military (and selected civilian) users still enjoy some technical
advantages which can give quicker satellite lock and increased accuracy.
The increased accuracy comes mostly from being able to use both the
L1 and L2 frequencies and thus better compensate for the varying
signal delay in the ionosphere (see above). Commercial GPS receivers
are also required to have limits on the velocities and altitudes
at which they will report fix coordinates; this is to prevent them
from being used to create improvised cruise or ballistic missiles.
Many synchronization systems use GPS as a source of accurate time,
hence one of the commonest applications of this use is that of GPS
as a reference clock for time code generators or NTP clocks. For
instance, when deploying sensors (for seismology or other monitoring
application), GPS may be used to provide each recording apparatus
with some precise time source, so that the time of events may be
recorded accurately.
| role - a set of features; a role is assigned to a user and governs which features a user has access to.
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Arriving at Shipper Macro - Macro sent by driver when arriving at shipper
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gps navigation system - Yahoo! News Search Results
gps navigation system - Yahoo! News Search Results
25 Jan 2012 at 6:01am
NEW YORK, Jan. 25, 2012 /PRNewswire/ -- Reportlinker.com announces that a new market research report is available in its catalogue: Global GPS Navigation and LBS Market 2010-2014 http://www.reportl...
31 Jan 2012 at 6:08am
ROCKVILLE, MD-- - MarketResearch.com has announced the addition of the new report "Global GPS Navigation and LBS Market 2010-2014," to their collection of Electronics market reports. For more ...
3 Feb 2012 at 3:30pm
Getting from points alpha to bravo is cool. Getting there without going through a mind-numbing traffic jam is just the cat's pajamas! These days, any old portable navigation device can accomplish t...
14 Jan 2012 at 10:31am
Japan is working on a new global positioning system that will be 10 times more accurate than the system that is currently in use and will be able to pinpoint a location down to just one meter.
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