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					                                GLOBAL POSITIONING SYSTEM(GPS):-

             GPS, which stands for Global Positioning System, is a radio navigation system that allows land,
     sea, and airborne users to determine their exact location, velocity, and time 24 hours a day, in all
     weather conditions, anywhere in the world.

             GPS is made up of three segments: Space, Control and User. The Space Segment is composed of
     24 to 32 satellites in Medium Earth Orbit and also includes the boosters required to launch them into
     orbit. The Control Segment is composed of a Master Control Station, an Alternate Master Control
     Station, and a host of dedicated and shared Ground Antennas and Monitor Stations. The User Segment is
     composed of hundreds of thousands of U.S. and allied military users of the secure GPS Precise
     Positioning Service, and tens of millions of civil, commercial and scientific users of the Standard
     Positioning Service. GPS satellites broadcast signals from space that GPS receivers use to provide three-
     dimensional location (latitude, longitude, and altitude) plus precise time.

                GPS systems are used for both Military and Civilian applications.

     Military applications include

                   Navigation
                   Target tracking
                   Missile guidance
                   Serch and rescue operations
                   Map creations

A GPS tracking unit is a device that uses the Global Positioning System to determine the precise location of
person, or other asset to which it is attached and to record the position of the asset at regular intervals. The
ocation data can be stored within the tracking unit, or it may be transmitted to a central location data base, or
 nnected computer, using a cellular (GPRS), radio, or satellite modem embedded in the unit. This allows the
 tion to be displayed against a map backdrop either in real-time or when analysing the track later, using
d software.

Therefore, the study of Global Positioning System(GPS) is of major concern.

Description: protect our earth from global warming,,,.......