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What are the operations on the signals recieved by a GPS reciever ? How does it process them towards achieving a position fix ?

I need explanation with the decoding and correlating part of the signal. How does it determine the position of a satellite when the signal it is recieving from many satellite is mixed up with the signals from other satellites in the wireless medium .

I'd be glad if you point me to a good article/link that explains this well. Thanks

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If you want to lern about GPS signals I recommend you to look on this website http://www.kowoma.de/en/gps/signals.htm generally this site is very useful if you are clueless in GPS subject

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