Open source codes for L1 CA Positioning

I am looking for open-source C or C++ codes for GPS L1 CA positioning
(either for traditional GPS receiver or software receiver). I knew about 10
years ago, Mitel/Zarlink once provides source codes for GPS L1 CA in their
GPS Orion receiver development kit, but could not find it any more. Does
anybody know any other source?

Thank you in advance.

Johnson


.

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