Global Positioning Systems - Research Article from Macmillan Science Library: Computer Sciences

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Gps Components

Space Segment.

The space segment is a constellation of twenty-four NAVigation Satellite Timing and Ranging (NAVSTAR) satellites orbiting the Earth in circular orbits at 20,278 kilometers (12,600 miles). The constellation is composed of six orbital planes, each tilted 55 degrees with respect to the equator. Each orbital plane has four satellites spaced 60 degrees apart so that a minimum of five satellites are viewable from any location on the Earth. Although the constellation is comprised of twenty-four satellites, there are currently twenty-nine satellites in orbit (five are spares). The most recent satellite was launched on January 30, 2001.

Each satellite transmits precise time, position, and orbit information. In order to minimize or eliminate ionospheric distortion, the satellites transmit two signals with binary codes at different frequencies. The binary signals use a pseudo-random code (i.e., a binary signal with random noise-like properties), which obviates the need for great power or large...

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This section contains 1,055 words
(approx. 4 pages at 300 words per page)
Buy the Global Positioning Systems Encyclopedia Article
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Macmillan Science Library: Computer Sciences
Global Positioning Systems from Macmillan Science Library: Computer Sciences. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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