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Re: [Discuss-gnuradio] Carrier Phase Measurement

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] Carrier Phase Measurement
Date: Tue, 22 Oct 2013 18:04:24 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.0

Hi Raydel,
try Keep N in M (keep 1 in N) for the "sampling".
However, if you correctly employ a PLL, your phase will be static; if it's not, than the PLL is not doing it's job well.


On 10/22/2013 05:21 PM, Raydel Abreu (CM2ESP) wrote:
Hello all,

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 know 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 are 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. Frequency 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 but due to receiver drifting and sound card poor sampling stability the phase result was a phase rotation of several degrees by measured interval. Perhaps GNU Radio and the PLL functions it has could help to overcome the frequency drift in the measured carrier.

Thanks in advance,


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