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[Discuss-gnuradio] Numerical stability and accuracy of PLL blocks
From: |
Daniele Nicolodi |
Subject: |
[Discuss-gnuradio] Numerical stability and accuracy of PLL blocks |
Date: |
Fri, 20 Mar 2015 15:57:13 +0100 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 |
Hello,
does anyone know if any stability and accuracy evaluation of the digital
PLL as implemented in GNU Radio exist?
I'm trying to measure the frequency of a very low phase-noise signal and
I see strange artifacts for certain combinations of detuning (residual
frequency difference between the signal and the N210 center frequency)
and PLL bandwidth.
I already have re-implemented the PLL blocks to measure phase using a
more accurate arctan2() function than the one provided by Volk (which
uses a linear approximation for small angles) but I still see strange
things that I believe are due to the control loop going nuts due to
numerical problems.
If some work has already been done in this regard I could probably save
some time.
Thanks. Cheers,
Daniele
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