By French G.T.
There's an ever-growing provide of data concerning the worldwide Positioning approach. regrettably, those new (and now, a few now not so new) files appear to be positioned at every one finish of the comprehension scale: both on the "gee-whiz" point which primarily describes how fascinating and important this new application is, or on the engineer's point which starts off out with Keplerian orbits and Hopfield Modeling. What seems lacking is a accomplished, but effortless to appreciate, presentation of the worldwide Positioning process (GPS) for those that can have a really genuine have to observe this new expertise yet lack the fundamental figuring out essential to make very important, and sometimes pricey, judgements approximately it. hence this ebook. This ebook is designed to help an introductory direction at the basics of the worldwide Positioning process in accordance with a chain of photo representations and distilled concept-bullets. Math is scrupulously avoided-that point of data is quickly to be had via quite a few hugely technical courses and is not any extra worthy for many clients than is a textbook on electronics worthwhile for the customer of a tv set.
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Additional info for Understanding the GPS
One is located at Hawaii, another at the tiny Ascension Island off the West Coast of Africa (population 7 19), another at Diego Garcia off of the southern tip of India, and the fourth at Kwajalein, part of the Marshall Islands group in the Western Pacific. The three upload ground antennas are co-located with the monitor stations at Ascension Island, Diego Garcia, and Kwajalein. 25 The Space Segment The space segment consists of the complete constellation of orbiting Navstar GPS satellites. The current satellites are manufactured by Rockwell International and cost approximately $40 million each.
In this example, we already know that we’re 20,000 kilometers away from the first satellite (satellite “A”). We just don’t know in what direction. If we determine that we’re also precisely 22,000 kilometers from another, second satellite (satellite “B”), we find that the only place in the universe which is that distance away from satellite “B,” and is still 20,000 kilometers away from satellite “A,” is located somewhere on a circle where the two respective spheres intersect (shown as the black ellipse in the diagram).
This is not a reasonable assumption, as we’ve already seen, but for the sake of this illustration, let’s just say that it’s so. Also, for the ease of illustration, let’s say that the travel time is measured in whole seconds rather than in the millionths of seconds that are measured in reality. In our two-dimensional diagram we know that, being five seconds from the left satellite and six seconds from the right satellite, we can only be at the two possible points shown in the illustration where the two circles intersect.
Understanding the GPS by French G.T.