Galileo, European Satellite Navigation System |
Almost eight years ago, Europe embarked on a journey to
create its own navigation satellite system. Named the Galileo
positioning system, this global navigation satellite system was intended
for the European Union (EU) and European Space Agency (ESA) as an
alternative to the U.S. Global Positioning System (GPS). We all know
that the US Military runs the current GPS network system.
Concept building began as early as 1999 but it was four
years later that proponents agreed on the first stage of the Galileo
program. The main difference from the current GPS ran by the US is that
Galileo is intended primarily for civilian use, unlike the current one
which the U.S. military has arbitrary control over. The US has the right
to limit access or shut down totally public access to the GPS system
especially during times of war or when they opt to. The Galileo system
will only shut down access to during extreme circumstances.
Also, the Galileo project claims to be better than the
GPS in that it can provide location precision of around one meter. The
US GPS system provides only a 10 meter location precision. Also, the
Galileo system will be available to all users, which means both civil
and military are welcome to use it.
When finished, the Galileo system will consists of 30
satellites, 27 of those would be operational while the remaining three
will serve as active spares. The satellites will orbit the three
circular Medium Earth Orbit (MEO) planes which is located about 24,000
km altitude above the Earth, and at an inclination of the orbital planes
of 56 degrees with reference to the equatorial plane.
On December 28, 2005 the first experimental satellite
was launched. The Galileo In-Orbit Validation Element test satellite or
GIOVE-A was launched to test technology in orbit for the Galileo
positioning system. Two more test satellites, two more GIOVE, are
expected to be launched in the next two years.
GIOVE-B was supposed to be launched this year, but
problems after problems have pushed the Galileo project behind schedule.
This time, the reported problem was with the Russian rocket Soyuz which
was the one that supposed to place GIOVE-B into orbit.
Just like any space program today, the Galileo program
has been hit by rising costs. Plus, the European Union officials had to
step in when private partners began squabbling with each other which
caused several delays in the project. The estimated costs for the
project has now reached 10 billion euro or 14 billion dollars. After the
delays, the latest forecast for the system’s completion has been set to
2012.
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