Safriz
BANNED
- Joined
- Aug 30, 2010
- Messages
- 20,845
- Reaction score
- -1
- Country
- Location
sometimes i think Pakitan should devise its own navigation system.....GPS is nothing more than triangulation based on accurate timings and a knowledge of exact position of transmitting satellites in the celestial sphere.
The satellite transmits a signal at certain known frequency along with the exact time of the transmission of that signal,and satellite's own position at the time of signal transmission..The receiver calculated the time difference between the transmission and reception of the signal...and calculates its distance from the satellite...The receiver has to receive three or more satellites simultaneously to be accurate...Once the receiver calculated its distance from three satellites,and the position of satellites is exactly known...The receiver can calculate its position on earth,based on this information.
HowStuffWorks "2-D Trilateration"
The Americans had to launch 27 satellites to make sure at any given time anywhere on the earth at lest three satellites will always be above horizon....A ground earth station at an air force base in USA tracks all the satellites accurately...using laser range finding and a complex software corrects for atmospheric deterioration of laser and also for accurate timings an atomic clock is used which transmits time to the satelites...Th lasr range finding and some other classified systems calculate exact position of satellites on the sky and transmits that info to individual satellites.
Pakistan does not need a global coverage,and so a limited system can be devised.......
The satellite transmits a signal at certain known frequency along with the exact time of the transmission of that signal,and satellite's own position at the time of signal transmission..The receiver calculated the time difference between the transmission and reception of the signal...and calculates its distance from the satellite...The receiver has to receive three or more satellites simultaneously to be accurate...Once the receiver calculated its distance from three satellites,and the position of satellites is exactly known...The receiver can calculate its position on earth,based on this information.
HowStuffWorks "2-D Trilateration"
The Americans had to launch 27 satellites to make sure at any given time anywhere on the earth at lest three satellites will always be above horizon....A ground earth station at an air force base in USA tracks all the satellites accurately...using laser range finding and a complex software corrects for atmospheric deterioration of laser and also for accurate timings an atomic clock is used which transmits time to the satelites...Th lasr range finding and some other classified systems calculate exact position of satellites on the sky and transmits that info to individual satellites.
Pakistan does not need a global coverage,and so a limited system can be devised.......
Last edited by a moderator: