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May 21, 2012, 8:59:02 pm, America/Chicago
What Satellite Mobile Phones Are And How They Are Used
Satellite mobile phones are devices that use orbiting satellites in space to connect different users. Their mode of operation is similar to that of ordinary devices we use for communication only that the normal ones connect by way of terrestrial transceivers. They are used to make calls, send messages as well as provide internet service.
The stations that are used can be found at an altitude of about 35-40,000 kilometers (21-25,000 miles). When using the service, coverage is mostly dependent on physical orientation of various systems. Coverage may be worldwide or confined to specific locations in a system. The coverage capability is also confined to various communication laws that a country holds.
Such stations are geostationary in that they are suspended in space at certain locations. They have an economic advantage of only using approximately four satellites. This is because the cost of setting up such stations is rather expensive and thus only having to install four makes it viable. However, some delays when making calls occur due to the high altitude and users being far apart from each other.
Another way they may be put to use is the use of low-earth orbiting satellites. Their altitude is much lower of about 600 to 1100 kilometers (372 to 683 miles). No coverage gaps are experienced when using the lower earth orbiting stations. The only disadvantage is that many of them must be installed to ensure that services are available at all times. This is because of their orbiting nature meaning it covers an area for only a few minutes.
Long ago satellite mobile phone devices were large and heavy and also had long retractable antennas. Improvements have seen them change with time and present ones are similar in design just like ordinary cell phones. Satellite mobile phones are mostly used by military systems but are now also used by private individuals. They are used majorly to cover areas with low cell coverage like remote areas or in the deep seas.
Installations used in ships include a rotating microwave antenna that automatically tracks overhead stations. They are used because a ship is always sailing hence requires to contact satellites at different locations.The phone users must be outdoors to maintain good signal strength or must employ the services of an external antenna connector when using them indoors.
Costs of acquiring a satellite phone are rather expensive compared to ordinary cell phones. The price ranges from a few thousand dollars depending on specifications of the terminal and the signal strengths that it is capable of picking up. They have an advantage of being able to contact the other cells from anywhere and can thus be used to make distress calls from any region.
Different laws govern satellite mobile phones usage in various countries. It is advisable to ensure that one is well conversant with the laws applicable in the region of usage lest they find themselves on wrong side of the law. Countries like North Korea as well as Myanmar are examples of countries that have ban use of their usage. Some of the technology involved may be hard to monitor for various countries with low technology development.
