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In brief it is a global system, a system which locates anything on earth in terms of its co-ordinates i.e. altitude, longitude and latitude. To achieve this, there is a satellite network, control station network and receivers, which will receive the data from the satellites and let you, know on some form of display where you are. One can connect the receiver to computer and get your location on a map background or whatever modification one wants.

Introduction:
The concept of the Global Positioning System evolved in early days of 80’s. It was proposed for a worldwide navigation system to locate the objects or the roots and related purpose. This was the concept by US military. Although it was developed for the military, it was seen that it would be very much useful to civilians also. Advancements in field of electronics also helped the thing a lot to bring the prices down of the devices required in it. Before that it was for military only, which can afford such a costly affair. Due these reasons it helped a lot to make the system open for the entire rest world. GPS is relatively much better than other systems and it is on its way to becoming the primary means of navigation in most applications.

How our position is decided by using this system can be better explained thinking an example, which will be requiring a little bit knowledge of geometry.

Imagine you are at a location about which you are not at all aware of. If somebody tells you that you are 15km apart from a village ‘A’. Then you can think yourself on a circle of radius 15km from the village ‘A’ as center point. Now further you got known that you are 20km apart from village ‘B’. So now it is easier for you that you can say you on one of the two points, which are the intersecting points of the two circles of radius 15km and 20km. If you more get knowledge that you are 30k away from third village say ‘C’, then it’s pretty easy to say on which point you are. That will be the unique point of intersection of the three circles.

Yes, the same logic is applied in this system. Here you are told that you are this much distance away from a satellite, and all the satellites to which the receiver can view tell the same. So as in the example we needed 3 tellers to locate in a 2D environment, here you need 4 tellers (satellites) to tell your location in a 3D environment. Remaining is the part of the calculation and displaying it, which a receiver does.

The civilian benefits of using a GPS are almost unlimited. The ability to determine the receiver’s location allows GPS receivers to perform as a tool for surveying and also as a tool for navigation. The GPS has the ability to determine relative movement, and as a result, can calculate local velocity and orientation. These benefits are most commonly used in vessels or photographs of the earth. Time transfer is also a GPS skill which allows clocks to become synchronized to exact standards. GPS has revolutionized the synchronization of the planet – there aren’t very many tools out there that can say the same thing!
Finally, by using the GPS measurements of the planet, scientists are able to better understand the Earth’s environment, such as the atmosphere and planet’s gravity. By observing how those environmental components alter the prorogation of GPS signals, scientists can find out new information on the progression of the planet.
Since those early days in 1993, the GPS system has come a long way. In 1994, a complete constellation of 24 satellites was in orbit around the Earth. By 1996, U.S. President Bill Clinton, issued a statement that declared the creation of an Interagency GPS executive board – as a result, GPS systems became more advanced and enhanced user accuracy and reliability, particularly with aviation. The most recent launch of a GPS satellite was in November of 2006, with the oldest satellite still in orbit since 1991, still circling the globe.
GPS systems have come a long way since the idea came to fruition in the Second World War. GPS has allowed the common person the ability to navigate, with exact precision, around the globe. When you know where you are in the world, you can go anywhere! These units are very important to personal safety as they can be used to track vehicles and other valuable items. Here are some ways that citizens are using GPS:


Coming to actual system, it can be better viewed in the following segments or parts, which views the GPS System as whole:

1. Space Segment
2. Control Segment
3. User Segment

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vehicle tracking system is an electronic device installed in a vehicle to enable the owner or a third party to track the vehicle's location. Most modern vehicle tracking systems use Global Positioning System (GPS) modules for accurate location of the vehicle. Many systems also combine a communications component such as cellular or satellite transmitters to communicate the vehicle’s location to a remote user. Vehicle information can be viewed on electronic maps via the Internet or specialized software.
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