[USRP-users] Phase Synchronization of two usrp b210's

Aravind Dhulipalla aravind.dhulipalla at avx.com
Mon Feb 11 18:34:58 EST 2019


Hi Marcus,

Yes, I am following the link and using an external 10MHz and 1pps reference
signals. The way I am trying to synchronize is to have two usrp's transmit
different sine waves one with constant phase and the other with a varying
phase from 0 to 360degrees. I am calculating the sum of amplitudes of the
received signals and the phase at which the amplitude sum is maximum will
be the phase offset. By following this approach I am getting a phase offset
between 0 to 3 degrees. But when I issue the next stream command with sine
wave of calculated phase offset I am seeing a huge phase difference between
them anywhere between 0 to 180 degrees for each run. I am not sure if my
approach is a correct one.

Thanks
Aravind.

On Sun, Feb 10, 2019 at 12:59 AM Marcus Müller <marcus.mueller at ettus.com>
wrote:

> Hi Aravind,
>
> first of all, have you seen
> http://files.ettus.com/manual/page_sync.html ?
>
> You'll find in the last paragraph that after each tuning, your phase
> relationship between different B210s will be random, but constant for
> the run (aside from minor PLL drift).
>
> So, you need to tune, and then calibrate; how that can be done depends
> on the system you're building.
>
> Best regards,
> Marcus
>
> On Fri, 2019-02-08 at 17:03 -0800, Aravind Dhulipalla via USRP-users
> wrote:
> > Hi,
> >
> > Has anyone achieved phase synchronizing between two usrp b210's using
> > external reference and pps? If yes I would appreciate any help that I
> > can get.
> >
> > Thanks
> > Aravind.
> >
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The contents of this transmission are Ethertronics Inc. Confidential and 
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Ethertronics Inc. The information is intended to be for the use of the 
individual or entity named on this transmission. If you are not the 
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and delete the message without disclosing it. Thank you 




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