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.
| GPS Navigation System Articles>> |
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Yahoo! News Search Results for gps navigation system
Yahoo! News Search Results for gps navigation system
11 Mar 2010 at 5:23am
New Global Positioning System (GPS) data released today by GPS-navigation provider TeleNav offers a number of insights into the behaviors--and preferences--of U.S. drivers.
9 Mar 2010 at 7:19pm
by Staff Writers Moscow, Russia (RIA Novosti) Mar 10, 2010 Russia and India might establish a joint venture to produce navigation equipment for GPS and its Russian equivalent Glonass, the head of t...
9 Mar 2010 at 10:21am
Russia and India might establish a joint venture to produce navigation equipment for GPS and its Russian equivalent Glonass, the head of the Russian federal satellite navigation operator said on Tu...
9 Mar 2010 at 4:20pm
STUART ?Coast Guard Auxiliary Flotilla 59, based at Sandsprit Park, will offer a seminar on Global Positioning System navigation on March 20 at 9 a.m.Mariners have a variety of resources for naviga...
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