Global positioning system(GPS)

 


1.Global positioning system(GPS) was invented in 1973 by United State Military, and referred to as 'Navstar'(navigation satellite with the timing and ranging ).

2.The system was initially developed for use by the us military. They were using this  satellite for surveillance purpose on neighboring countries.

3.The first satellite was launched in 1978 and full constellation was in place and operating by 1994 .

4.GPS is now widely available for use by many applications including aircraft navigation.

5. The system compromises a space segment, user segment and control segment. 

6.The control segment consist of ground based transrecivers which monitors the satellite health.e.g. NASA, ISRO.

7.The user segment can be an Aircarft, any personnel.

8.The space segment consist of group of 24 Satellite.

9.24 satellite (the space segment )in orbit around the earth send data via radio link that allows aircraft receivers (the user segment) to calculate precise position, altitude, time and speed on 24 hours worldwide all-weather basis.

10.The principles of satellite navigation are based on radio wave propagation, precision timing and knowledge of each satellites position above the earth, this is all monitored and controlled by a network of station( the control segment). 

11.Other system in operation include the Russian global navigation satellite system : GLONASS that was established soon after GPS and the European system Galileo.

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