Things have come a long way since the days of the 'Sputnik'!
Satellite systems now provide both voice and data communication
for areas of the world where there is no land or cell phone coverage.
Satelite telephones help us to keep in touch when in the air or out
at sea. It also helps us to keep track and in contact with those
brave adventurers who test the boundaries of endurance and skill.
We can follow their routes, talk to them and receive photographs
and film from wherever they are and be instantly ready to help
when things don't go according to plan.
How does it work? A signal is transmitted from the satelite
phone, via an antenna to an orbiting network of satellites then
back to a ground station and a standard phone network. Sounds
good, eh? However, the line of site signal path between satellite
phone antenna and satellite must not be obstructed. Even bad weather
can be a problem. Reception is generally much better outdoors
but if you are on a boat or in a plane an external antenna might
be needed.
Presently there are five main satellite phone service providers.
Global Star and Iridium remain the largest. They offer a variety
of options for both businesses and the average "Joe Bloggs".
Iridium is probably the best known for a variety of reasons.
The company uses a system of 66 operational low-earth-orbit
satellites and they have 13 spare satellites too. The satellites
are in orbits approximately 485 miles above the Earth's surface.
They supply to an extensive variety of markets which include
construction, mining, government, leisure and maritime. They
also provide equipment to the military and to rescue and disaster
relief organisations. Companies tend to sell their services
through a collection of service partners, value-added resellers
and manufacturers.
You may have noticed that that satellite phones are used regularly
by the military, shipping and airlines. They also play an important
part in disaster zones. Charitable organisations need to find out
what help is required as soon as possible and the landlines and
cell networks are often the first to be disrupted. Tracking the
signal can help guide helicopters into the most affected and
possibly isolated areas to deliver aid quickly.
On a more serious note, satellite phones are also being used in
the fight against terrorism. To protect the Alaskan pipeline
where it is vulnerable, trucks passing close by are fitted with
satellite phones. If the truck is hijacked a signal is sent via
the network and the vehicle can be disabled immediately.
As a method of communication satellite phones remain a very
expensive option. It is more expensive than most cell phone
calls. As the technology improves and becomes more widely used,
the prices should begin to drop. At the moment Iridium claim
that the cost of a satellite phone call is similar to the cost
of an international roaming call. To improve public perception
and possibly build the consumer market the industry is fund
raising in Washington state to provide satellite phones and
airtime free of charge to US National Guard soldiers serving
in Iraq.
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