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:
“It snowed in spring on earth so dry and warm
The flakes could find no landing place to form.”
—Robert Frost (1874–1963)
“The human spirit is itself the most wonderful fairy tale that can possibly be. What a magnificent world lies enclosed within our bosoms! No solar orbit hems it in, the inexhaustible wealth of the total visible creation is outweighed by its riches!”
—E.T.A.W. (Ernst Theodor Amadeus Wilhelm)
“Books are the best things, well used; abused, among the worst. What is the right use? What is the one end, which all means go to effect? They are for nothing but to inspire. I had better never see a book, than to be warped by its attraction clean out of my own orbit, and made a satellite instead of a system.”
—Ralph Waldo Emerson (1803–1882)
“You may be used to a day that includes answering eleven phone calls, attending two meetings, and writing three reports; when you are at home with an infant you will feel you have accomplished quite a lot if you have a shower and a sit-down meal in the same day.”
—Anne C. Weisberg (20th century)
“The great networks are there to prove that ideas can be canned like spaghetti. If everything ends up by tasting like everything else, is that not the evidence that it has been properly cooked?”
—Frederic Raphael (b. 1931)