I am new to GNU Radio and I am still learning the basic. I have a quick
question. What blocks and which way can I use in order to “sample” and
the phase of a tuned carrier at regular intervals.
General idea: Let’s suppose there is a carrier, after applying proper
tuning (Freq Xlating FIR Filter, etc), I apply a PLL module (not sure
which: PLL Carrier Tracking or PLL Ref Out) in order to remove possible
drift from the receiver and output a steady carrier. How can I sample at
regular interval that corrected carrier phase. Assuming that intervals
really equals I guess every time I should obtain the same phase value.
I will really appreciate any help in this matter, perhaps someone could
point me in the right direction.
My purpose is to observe ionospheric phase scintillation from a
geostationary satellite beacon, which outputs a steady carrier.
drifting should be related to RTL-SDR dongle and part of phase changes
related to ionospheric irregularities.
I attempted something similar with SpectrumLab and an analogue receiver
due to receiver drifting and sound card poor sampling stability the
result was a phase rotation of several degrees by measured interval.
Perhaps GNU Radio and the PLL functions it has could help to overcome
frequency drift in the measured carrier.
Thanks in advance,