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

[Marcus Müller]

Hi Francisco,

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.

Best regards,
Marcus

[1] Warning, a 8-million-points autocorrelation might take some CPU power. You might want to apply a bit of FFT magic.

On 20.08.2015 04:04, Francisco Albani wrote:

Hi!

After googling a lot and searching in this lists archive, I couldn't find any recording of IQ samples from GPS signals.

I'm trying to record one myself, with no luck so far because (I suspect) of a malfunctioning active antenna.

Would anybody with the right equipment be so kind to record some minutes of 4 MHz around 1.57542 GHz and share the recorded iq samples file?

Many thanks in advance!

Francisco.

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