GLOBAL POSITIONING SYSTEM EBOOK
Read "Global Positioning System Theory and Practice" by Bernhard Hofmann- Wellenhof available from Rakuten Kobo. Sign up today and get $5 off your first. If you're looking for an up-to-date, easy-to-understand treatment of the GPS ( Global Positioning System), this one-of-a-kind resource offers you the knowledge . This thoroughly revised edition of the Artech House bestseller, Introduction to GPS: The Global Position System offers professionals and.
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This book is dedicated to Dr. Benjamin William Remondi for many reasons. The project of writing a Global Positioning System (GPS) book was con- ceived in. The Global Positioning System (GPS) is a U.S. space-based navigation The GPS system was developed as a worldwide satellite based system by the U.S. Chapter 1 of the book introduces the GPS system and its The Global Positioning System (GPS) is a satellite-based navigation system.
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Would you like us to take another look at this review? No, cancel Yes, report it Thanks! You've successfully reported this review. We appreciate your feedback. OK, close. Write your review. December 6, Imprint: Springer ISBN: Essentially, the listener is listening for and timing the echo. The listener knows how fast the sound travels through the water and so can quickly and easily calculate how far away that something the sea floor is. The second diagram illustrates the concept of one-way ranging in a way that most of us are familiar with-the thunderstorm.
We know that by counting the seconds that it takes for the thunder to reach us after the flash of lightning, we can determine how far away the storm is. We know that it takes about five seconds for sound to travel one mile and we know precisely when the lightning occurred. Even though the light from the lightning does take a finite span of time to reach us, considering how relatively close the storm is and how fast light travels, for all intents and purposes, we see the flash the instant it occurs.
This is, conceptually, how GPS works. The difference is that GPS measures radio-wave transit time rather than sound. If we happen to know that the range distance to a particular satel- lite is precisely 20, kilometers for example , then the only place in the universe which is that precise distance from the satellite is somewhere on the surface of an imaginary sphere that has a radius of 20, kilometers.
It could be in any direction. And that positional ambiguity is still really big. What we need is a range to yet another satellite. We now know where we are precisely-that is, at either one of two possible points. In fact, one of the two points is almost always out somewhere where it makes no sense, like thousands of kilometers out in space.
So, there it is. Three satellite ranges have given us our precise location in the universe. Well, not exactly. Actually, it turns out that four satellites are really needed to insure an accurate position. To acquire an accurate position, we have to make very, very precise time measurements.
There is, however, a way to largely eliminate this problem. It starts at the satellites themselves. To keep very accurate time, each satellite carries four atomic clocks on board, two rubidium and two ce- sium. These clocks are accurate to within billionths of a second per month. This is certainly accurate enough for our needs, but not really practical for our ground-based receivers.
We could illustrate the concepts as three dimensional as is the case in reality but it would make the diagrams unwieldy and more confusing than they need to be. This is not too unrea- sonable an assumption since so much time and money went into them and the fact that they are constantly monitored and corrected by the Control Segment. Another assumption for this diagram is that the receiver clock and the satellite clocks are in perfect synchronization.
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. We also know that the receiver is smart enough to know that one of those two points is not reasonable and rejects it. That, then, leaves only one possible point where we could be located, marked on the diagram with a star. Receiver Time One Second Fast The fact of the matter is that the satellite and receiver clocks are never perfectly synchronized.
Since in this application distance is mea- sured by time, we can further simplify things by just treating time as if it were distance.Ehsan Khamehchi. James Collins from the United States. Zhen-Dong Cui. Show next edition. Continue shopping.