Re: Galileo Frequency Shifting and Filtering

[Marcus D. Leech]

On 01/03/2023 08:50, David Dima wrote:

Hi,

Sure, but the power of this kind of signals is below noise level. Current antenna amplifies 30dB but it still not enough to see anything in the spectrum (I have checked it alredy).

Regards,

David

    You generally won't be able to see GPS signals in the
    spectrum--unless you have a spectacularly good LNA right up at
      your antenna, and that antenna better not be a dielectric patch
    antenna (as is typical for GNSS/GPS antennas).

El mié., 1 mar. 2023 7:27, It's a cat <luoshumymail@gmail.com> escribió:

If you have a signal generator, GNSS simulator or a high gain antenna, you can verify your settings by adding a spectrum display (Qt Freq Sink) or something like that to your receiver path.

Because many things can go wrong in your setup, if you misunderstand something. Just try to verify this directly. If there's a signal you should be able to see it on the spectrum display.

David Dima <daviddimavd@gmail.com> 于2023年2月28日周二 02:00写道：

Hi guys,

I am trying to simultaneously record Galileo's E5a and E5b signals as follows:

I have tried to record them separately by tuning the local oscillator in the middle of the signals bandwidths and sampling at 25MHz and it worked. But when I try to shift and filter to get the signals in a different file, it does not work. I have no idea what am i doing wrong.

Galileo's Signal Plan is as follows: