Re: [Discuss-gnuradio] GPS Signals recorded IQ samples file

[Sylvain Munaut]

Hi,

> are you sure you did not see GPS? The problem is that GPS is often below the
> thermal noise floor and only detectable by the virtue of processing gain.
> I'd try and take a whole lot of samples (like: 2s worth of samples), and
> calculate the autocorrelation[1]. You should see peaks at multiples of 1 ms,
> because that's the spreading code's period.

You can also square the signal, then decimate it a bit and FFT it and
you'll see peaks at whatever doppler the sat currently has. (so you'll
see different peaks for different sats).


Cheers,

    Sylvain