system of knowing one's exact position on this earth is known as the
'Global Positioning System'. Precise positioning of any location can
easily be done with the help of this System. If anyone has a Global
Positioning System receiver and if the sky remains clear then no one is
going to be lost on this Earth. The receiver is a pocket-sized gadget
that makes us inform about our exact position on this earth at any
moment. One thing is that this pocket-sized gadget or receiver is very
expensive and it also involves a lot of technical ingenuity.
The primary function of Global Positioning System is the navigation in
three dimensions. The Navigation receivers are used for aircraft,
ships, and ground vehicles and sometimes it is also carried in hands by
The working of the System The
GP System provides some special satellite signals which is processed in
the receiver. These GPS receivers not only track the exact location but
can also compute velocity and time. The positions can even be computed
in three dimensional views with the help of four GPS satellite signals.
The Space Segment of the Global Positioning System consists of 27
Earth-orbiting GPS satellites. There are 24 operational and 3 extra (in
case one fails) GPS satellites. These satellites move round the Earth
in 12 hours and send radio signals from space that is being received by
the GPS receiver.
The control of the Positioning System consists of different tracking
stations that are located across the world. These monitoring stations
help in tracking signals from those GPS satellites that are
continuously orbiting the earth. The Space Vehicles transmit microwave
carrier signals. The users of the Global Positioning System have GPS
receivers that can convert the satellite signals by which one can
estimate the actual position, velocity and time. Four satellites are
required to track the three dimensional location and time. The
operation of the system is based on a simple mathematical principle
called Trilateration. The Trilateration may be of two types i.e. 2-D
Trilateration and 3-D Trilateration. In order to make the simple
mathematical calculation the GPS receiver should know two things.
Firstly the location of the place is to be traced by at least three
satellites above the place. Second is the distance between the place
and each of those Space Vehicles. Units those have multiple receivers
can pick up signals from several GPS satellites at a same time. These
radio waves are electromagnetic energy that travels at the speed of
GPS is specially a Satellite Navigation System that helps in tracking the exact location with the help of satellites. The
Global Positioning System is mainly funded and controlled by the U.S Department of Defense (DOD). The system was initially
designed for the operation of U. S. military. But today, there are also many civil users of GPS across the whole world. The
civil users are allowed to use the Standard Positioning Service without any kind of charge or restrictions.
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