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GPS is a very newly emerged sophisticated branch of information technology. GPS collects information of the ground surface as well as the surrounding atmosphere. This is in short the GPS Service. In GPS Service the main technology is to capture precise microwave signals from at least 24 medium earth orbit satellites. And thus GPS Service e nables the users to identify the location. In Global Positioning System Services, GPS signals propagate nearly at the speed of light, this represents an error of about 3 meters. But the variation of speed propagation depend on the material. It is because of the variation that the radiation is passing through. Mainly three initial parameters are needed to introduce a successive GPS Service. These are -
• length of object
• width of object
• height of object
In a Global Positioning System(GPS) there are three segments namely -
• The space segment – it is composed of 24 GPS satellites. These satellites are again equally distributed among six circular orbital plane.
• Control segment – It consists of the monitoring stations situated in Colorado springs, Colorado, Hawaii, Ascension Island, Diego Garcia, Kwajalein etc. which observes the flight path of satellites. Those informations are operated by NGA and sent to the Air Force Space Command.
• User segment – In GPS Service user segment consists of a receiver . It receives the frequency of signals which helps to determine location of an object.
for Global Positioning System Service there are few things which should be kept in mind. These are -
• For 3D positioning system 4 satellites are needed – the intersection of 4 satellites can determine the center point of a sphere.
• For 2D positioning system 3 satellites are needed – with the help of it an arc of intersection can be obtained. This arc of intersection helps to determine the 2D object very easily.
• De clock – In GPS Service, after determining the position received by the GPS receiver, the correct time is set on the GPS receiver.
• Position with single satellite – in this service of GPS, a highly accurate clock is set on the GPS receiver. With the accurate time GPS can determine the exact location of an object, with the help of only one satellite.
GPS Services : As a very new, sophisticated, organized, scientific branch of information technology, GPS technology is gaining popularity very rapidly. The well known GPS Services are as follows :-
Agriculture -
• tracking
• yield monitoring
• tractor guidance
• soil sampling
Auto sales and rentals -
• tracking rental cars
• monitoring high risk auto loans
GPS Service in bus and taxi -
• snow plow tracking
• GPS equipped taxi routes
• school bus tracking
Camera and photography -
• geocoding photos
• time sequence photography
Fishings -
• mapping of trolling
• mooching your hot spots
Recretion and Sports -
• hiking
• mountain biking
• hunting
Corporate fleet management -
• cell phones with GPS technology
Kids and pets -
• tracking your kids
• tracking your pets
• blind walker guidance
Law enforcement -
• on line criminal map
• tracking suspected criminals
• tracking convicted criminals
Therefor it maybe concluded that GPS Services are provided to land, sea and air also. As it gives information about location with very high precision and accuracy. GPS Service is gaining popularity with a very rapid pace with various applications.
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