# GPS Code Phase usage

During Cross-correlation process:

xcorr=ifft(fft(a)fft(b)∗)


we have frequency offset and code phase offset.

How is it used later in the process of finding a user location?

• Hi Eugene! This question is a little broad – the answer would be explaining GPS receivers, and that is covered in very many places, and the fact that you've made this plot indicates you've read something like that already. So, could you, based on the literature you've read, explain what exactly your remaining question is? – Marcus Müller Mar 13 at 17:12
• I wonder how this code phase is used later in pseudo range estimation? We get this code phase during acquisition step but what we do with this number in tracking step? – Eugene Mar 14 at 8:55