Low Earth Orbit Satellite Phone Networks
The two current operational low Earth orbit satellite phone networks are able to track transceiver units with accuracy of a few kilometers using doppler shift calculations from the satellite. The coordinates are sent back to the transceiver unit where they can be read using AT commands or a graphical user interface. This can also be used by the gateway to enforce restrictions on geographically bound calling plans.
Read more about this topic: Satellite Navigation
Famous quotes containing the words earth, orbit, satellite, phone and/or networks:
“I wish that everything on earth were just
As certain as the meals we’ve had. I wish
The meals we haven’t had were, anyway.”
—Robert Frost (1874–1963)
“The Fitchburg Railroad touches the pond about a hundred rods south of where I dwell. I usually go to the village along its causeway, and am, as it were, related to society by this link. The men on the freight trains, who go over the whole length of the road, bow to me as to an old acquaintance, they pass me so often, and apparently they take me for an employee; and so I am. I too would fain be a track-repairer somewhere in the orbit of the earth.”
—Henry David Thoreau (1817–1862)
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—Ralph Waldo Emerson (1803–1882)
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and the love, whatever it was, an infection.”
—Anne Sexton (1928–1974)
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—Louise Lague (20th century)