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    • What is GPS?
       The Global Positioning System (GPS) is a worldwide radio-navigation system formed from a constellation of 24 satellites and their ground stations

       

       GPS uses these "man-made stars" as reference points to calculate positions accurate to a matter of meters. In fact, with advanced forms of GPS you can make measurements to better than a centimeter!  

       

       In a sense it's like giving every square meter on the planet a unique address.  

       

       GPS receivers have been miniaturized to just a few integrated circuits and so are becoming very economical. And that makes the technology accessible to virtually everyone. 

       

       These days GPS is finding its way into cars, boats, planes, construction equipment, movie making gear, farm machinery, even laptop computers.  

       

       Soon GPS will become almost as basic as the telephone. Indeed, at Trimble, we think it just may become a universal utility.

      • <img src="http://www.trimble.com/gps/graphics/whatis.gif"><br><br>Gps is a short form that stands for (The Global Positioning System) is a worldwide system that circels or navigate formed of 24 satellites and the other ground stations.<br><br>

    • Why we need Differential GPS?

       

       Basic GPS is the most accurate radio-based navigation system ever developed. And for many applications it's plenty accurate. But it's human nature to want MORE! 

       

       So some crafty engineers came up with "Differential GPS," a way to correct the various inaccuracies in the GPS system, pushing its accuracy even farther. 

       

       Differential GPS or "DGPS" can yield measurements good to a couple of meters in moving applications and even better in stationary situations. 

       

       That improved accuracy has a profound effect on the importance of GPS as a resource. With it, GPS becomes more than just a system for navigating boats and planes around the world. It becomes a universal measurement system capable of positioning things on a very precise scale.

      • There are different Gps systems. The basic GpS is the most accurate radio-based navigation system ever created. Some crafty engineers came up with a differential Gps its a method to correct and change errors. The correction of errors showed the importance of GPS. It is used for boats and planes. Its a measurment system that can point out things or locations on a scale.

    • Why GPS?
       Trying to figure out where you are and where you're going is probably one of man's oldest pastimes. 

       

       Navigation and positioning are crucial to so many activities and yet the process has always been quite cumbersome. 

       

       Over the years all kinds of technologies have tried to simplify the task but every one has had some disadvantage. [view other Positioning Systems] 

       

       Finally, the U.S. Department of Defense decided that the military had to have a super precise form of worldwide positioning. And fortunately they had the kind of money ($12 billion!) it took to build something really good. 
       Why Did the Department of Defense Develop GPS? 
       

       In the latter days of the arms race the targeting of ICBMs became such a fine art that they could be expected to land right on an enemy's missile silos. Such a direct hit would destroy the silo and any missile in it. The ability to take out your opponent's missiles had a profound effect on the balance of power.  

       But you could only expect to hit a silo if you knew exactly where you were launching from. That's not hard if your missiles are on land, as most of them were in the Soviet Union. But most of the U.S. nuclear arsenal was at sea on subs. To maintain the balance of power the U.S. had to come up with a way to allow those subs to surface and fix their exact position in a matter of minutes anywhere in the world Hello GPS! 
       

       

       The result is the Global Positioning System, a system that's changed navigation forever.

      • IF you are lost and you what to find out where to or what to do. OR lets finally, the US decided the militaRY HAS TO HAVE a a super or excellent view or knowledge of the postions of the world. Finally they had built the global positioning that made navigation better and easier forever.

    • The GPS is made up of three parts: satellites orbiting the Earth; control and monitoring stations on Earth; and the GPS receivers owned by users. GPS satellites broadcast signals from space that are picked up and identified by GPS receivers. Each GPS receiver then provides three-dimensional location (latitude, longitude, and altitude) plus the time.
      • Gps is made of 3 parts, a satellite that circels the world. Gps signalsd are picked up from space, each gps device provides you with a 3d=Latitude, longitude, and altitude.

    • You will be amazed to what you'll read next. GPS satellites circle the earth twice a day in a very well defined orbit and sends signal information to earth. GPS receivers get this information and use a triangulation, as we learned before this method was used by sailer's, to calculate the user's location. What an incredible thing the GPS can do? The GPS has an incredible measurement for the distance that can determine the user's position and display it on the electronic map. This is how the GPS works is in it a useful thing.
      • You will be amazed to what you'll read next. GPS satellites circle the earth twice a day in a very well defined orbit and sends signal information to earth. GPS receivers get this information and use a triangulation, as we learned before this method was used by sailer's, to calculate the user's location. What an incredible thing the GPS can do? The GPS has an incredible measurement for the distance that can determine the user's position and display it on the electronic map. This is how the GPS works is in it a useful thing.


      • The Global Positioning System (GPS) is a satellite-based navigation system made up of a network of 24 satellites placed into orbit by the U.S. Department of Defense. GPS was originally made or established for military applications, but after that in years the government allowed for civilian use. GPS is a great system that works in any weather conditions, as well as it works in anyplace in the world for the whole time. Anyone could have it because there are no subscription fees or charges just for setting. GPS is good system that you could use all purposes traveling to help you figure things out. Also if you're going to huge shopping areas where you might get lost to exit you could use the GPS to mark the exit of that area. As well as it can be used to move around your country and mark that area on your GPS and it will be saved for any other time.

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    • Other Uses for GPS  Satellites

         

      GPS satellites are  used for navigation almost everywhere on Earth --  in an airplane, boat, or car, on foot, in a remote  wilderness, or in a big city. Wherever you are, if  you have a GPS receiver, you'll never be lost  again!

      • GPS is used for navigation exactly everywhere on earth, in an aeroplane , boat , or car, on foot, or in a big city where you are you can use it also to move around ur area.

    • A GPS receiver's job is to locate four or more of these satellites, figure out the distance to each, and use this information to deduce its own location. This operation is based on a simple mathematical principle called trilateration. Trilateration in three-dimensional space can be a little tricky, so we'll start with an explanation of simple two-dimensional trilateration.
      • <layer id="a9fc72544928d0857e4ea9f2c481ded8" diigo-title="faisal77's private highlight.(provided by Diigo)" owner="faisal77" mode="2" class="DIIGO-POWER" name="a9fc72544928d0857e4ea9f2c481ded8" style="background-color: rgb(255, 255, 153) ! important; outline-color: rgb(255, 0, 0); outline-style: solid; outline-width: 2px;"><img src="http://http://static.howstuffworks.com/gif/gps-3.jpg">A
        GPS receiver's job is to locate four or more of these satellites,
        figure out the distance to each, and use this information to deduce its
        own location. This operation is based on a simple mathematical
        principle called</layer> <b><layer diigo-title="faisal77's private highlight.(provided by Diigo)" owner="faisal77" mode="2" class="DIIGO-POWER" name="a9fc72544928d0857e4ea9f2c481ded8" style="background-color: rgb(255, 255, 153) ! important; outline-color: rgb(255, 0, 0); outline-style: solid; outline-width: 2px;">trilateration</layer></b>. Trilateration in three-dimensional space can be a little tricky

    • Getting perfect timing

       

       If measuring the travel time of a radio signal is the key to GPS, then our stop watches had better be darn good, because if their timing is off by just a thousandth of a second, at the speed of light, that translates into almost 200 miles of error!  

       

       On the satellite side, timing is almost perfect because they have incredibly precise atomic clocks on board.  

       
       

      Atomic Clocks

       

       Atomic clocks don't run on atomic energy. They get the name because they use the oscillations of a particular atom as their "metronome." This form of timing is the most stable and accurate reference man has ever developed.  

       
       

       But what about our receivers here on the ground?  

       

       Remember that both the satellite and the receiver need to be able to precisely synchronize their pseudo-random codes to make the system work. (to review this point click here

       

       If our receivers needed atomic clocks (which cost upwards of $50K to $100K) GPS would be a lame duck technology. Nobody could afford it.  

        

       Luckily the designers of GPS came up with a brilliant little trick that lets us get by with much less accurate clocks in our receivers. This trick is one of the key elements of GPS and as an added side benefit it means that every GPS receiver is essentially an atomic-accuracy clock.

      • <img src="file:///C:/DOCUME%7E1/admin/LOCALS%7E1/Temp/moz-screenshot-1.jpg" alt=""><br>On the satellite side, timing is almost the perfect thing because they have exact atomic clocks on board that are right and are very accurate. The gps designers made a trick that lets us get accurate clocks in our recievers or devices. This also means that every gps reciever is basically or origanlly an atomic accuracy clock.<br><br><img src="file:///C:/DOCUME%7E1/admin/LOCALS%7E1/Temp/moz-screenshot-2.jpg" alt=""><br><br><br>

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