| Our ancestors used to work extremely hard to | | | | receiver.There are more than 24 operational and |
| protect themselves from getting lost in this | | | | 3 extras (in case one fails) GPS satellites that |
| mysterious world. They used to erect | | | | moves round the Earth every 12 hours.The |
| monumental landmarks, study conventional land | | | | control of the Global Positioning System consists |
| maps and of course they used to mark the stars | | | | of different tracking stations that are located |
| in the night sky.But today it is very easy to know | | | | across the world. These monitoring stations help in |
| one's position. You just only have to get a | | | | tracking signals from those Space Vehicles which |
| pocket-sized gadget that will make you know | | | | are continuously orbiting the earth. The Space |
| your exact position on this earth at any given | | | | Vehicles transmit microwave carrier signals. The |
| moment. The system of knowing one's exact | | | | users of the Global Positioning System have GPS |
| position on this earth is known as 'Global | | | | receivers that convert the satellite signals which |
| Positioning System'. If anyone has a Global | | | | estimate position, velocity and time. Four satellites |
| Positioning System (GPS) receiver, and if the sky | | | | are required to track the three dimensional |
| remains clear, then no way can he get lost on this | | | | location and time. The primary function of Global |
| earth.Of note is that this pocket-sized gadget, the | | | | Positioning System is the navigation in three |
| Global Positioning System receiver, is quite | | | | dimensions. The Navigation receivers are used for |
| expensive and it also involves a fair amount of | | | | aircraft, ships, and ground vehicles and sometimes |
| technical ingenuity.GPS is specially a Satellite | | | | for personal use as well.With GPS receivers, |
| Navigation System that helps in tracking our | | | | precise positioning of any location can be done. |
| exact location with the help of satellites. The | | | | The Global Positioning system is based on a simple |
| Global Positioning System is mainly funded and | | | | mathematical calculation that operates through a |
| controlled by the U.S Department of Defense | | | | process called Trilateration. In order to make the |
| (DOD). The system was primarily designed for | | | | simple mathematical calculation the GPS receiver |
| the operation of U. S. military. But there are also | | | | should know two things.++ One is the location of |
| many civil users of GPS across the globe. The | | | | the place to be traced by at least three |
| Global Positioning System provides some special | | | | satellites.++ Secondly, is the distance between the |
| satellite signals which are then processed in the | | | | where the receiver is located and each of those |
| GPS receiver. These GPS receiver's not only | | | | Space Vehicles.All units have multiple receivers, |
| track the exact location, but can also compute | | | | and can pick up signals from several GPS satellites |
| velocity and time.The positions can even be | | | | at a same time. These radio waves are |
| computed in three dimensional views with the help | | | | electromagnetic energy that travels at the speed |
| of four GPS satellite signals. The Space Segment | | | | of light.The civil users across the world are |
| of the Global Positioning System consists of the | | | | allowed to use the Standard Positioning Service |
| GPS satellites. These satellites send radio signals | | | | without any kind of charge or restrictions. |
| from space which are received by the GPS | | | | |