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<p><a href="http://www.v-sol.co.uk"><img src="banner2.gif" width="535" height="89" border="0" alt="GPS TRACKING SYSTEMS"></a></p>
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<p><font face="Arial, Helvetica, sans-serif"><b>Intro to GPS</b></font></p>
<p><font face="Arial, Helvetica, sans-serif">The Global Positioning System
(GPS) is a satellite-based navigation system made up of a network of
satellites placed into orbit by the U.S. Department of Defense. GPS
was originally intended for military applications, but in the 1980s,
the government made the system available for civilian use. GPS works
in any weather conditions, anywhere in the world, 24 hours a day. There
are no subscription fees or setup charges to use GPS.</font></p>
<p><font face="Arial, Helvetica, sans-serif">Global Position System (GPS)
comprises of three parts:</font></p>
<ul>
<li><font face="Arial, Helvetica, sans-serif">24 satellites that orbit
the Earth</font></li>
<li><font face="Arial, Helvetica, sans-serif">Ground control stations
which monitor the satellites</font></li>
<li><font face="Arial, Helvetica, sans-serif">GPS receivers can be attached
to persons or animals, or mounted on object, such as a vehicle</font></li>
</ul>
<p><font face="Arial, Helvetica, sans-serif">The satellites are synchronized
to emit encoded navigational information (exact positioning and exact
time). Any vehicle equipped with a GPS receiver will intercept these
transmissions. Using a simple mathematical formula derived from triangulation,*
the receiver is able to calculate its own longitude, latitude, velocity
and even altitude. For companies implementing GPS applications, this
information, most often, would be transmitted to a central dispatch
or control location. </font></p>
<p><font face="Arial, Helvetica, sans-serif"><b>Global Positioning System
(GPS)</b></font></p>
<p><font face="Arial, Helvetica, sans-serif">Originally designated the
NAVSTAR (Navigation System with Timing And Ranging) Global Positioning
System, GPS was developed by the US Department of Defense to provide
all-weather round-the-clock navigation capabilities for military ground,
sea, and air forces. Since its implementation, GPS has also become an
integral asset in numerous civilian applications and industries around
the globe, including recreational uses (e.g. boating, aircraft, hiking),
corporate vehicle fleet tracking, and surveying. GPS employs 24 spacecraft
in 20,200 km circular orbits inclined at 55 degrees. These spacecraft
are placed in 6 orbit planes with four operational satellites in each
plane. All launches have been successful except for one launch failure
in 1981. The full 24-satellite constellation was completed on March
9, 1994. GPS receivers use triangulation of the GPS satellites' navigational
signals to determine their location. The satellites provide two different
signals that provide different accuracies. Coarse-acquisition (C/A)
code is intended for civilian use, and is deliberately degraded. The
accuracy using a typical civilian GPS receiver with C/A code is typically
about 100 meters. The military's Precision (P) code is not corrupted,
and provides positional accuracy to within approximately 20 meters.
Numerous on-line tutorials on how GPS works and its applications are
available, including those at the <a href="http://www.colorado.edu/geography/gcraft/notes/gps/gps_f.html">University
of Colorado</a>. GPS satellites are controlled at the Master Control
Station (MCS) located at Falcon Air Force Base outside Colorado Springs,
Colorado. The ground segment also includes four active-tracking ground
antennas and five passive-tracking monitor stations. </font></p>
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<p><a href="index.html"><font face="Arial, Helvetica, sans-serif">Introduction
to GPS</font></a><font face="Arial, Helvetica, sans-serif"> / <a href="gps.htm">More
on GPS</a> / <a href="gps_tracking_software.htm">Basic Concept</a><br>
<a href="gps_works.htm">How GPS Works</a> / <a href="avl.htm">GPS
Applications </a>/ <a href="contact.htm">Contact Us</a></font></p>
<p><font face="Arial, Helvetica, sans-serif" size="1">This infomation
was provided by <a href="http://www.v-sol.co.uk">Vehicle Solutions</a></font></p>
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<p><font face="Arial, Helvetica, sans-serif"><font size="2">gps tracking
/ gps tracking software / <br>
<a href="http://www.satellitetrackingsystem.co.uk/satellite_tracking.htm">satellite
tracking</a> / <a href="http://www.satellitetrackingsystem.co.uk/gps_satellite_tracking_signal.htm">gps
satellite tracking signal</a> /<br>
<a href="http://www.v-sol.co.uk">vehicle tracking</a> / <a href="http://www.v-sol.co.uk/vehicle-tracking.htm">vehicle tracking systems</a></font></font></p>
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