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List: usrp-users
Subject: [USRP-users] Adding Timestamps to B210 RX Samples
From: Alex Bouvy via USRP-users <usrp-users () lists ! ettus ! com>
Date: 2021-06-21 22:24:37
Message-ID: BYAPR06MB53523BE92F6B1451D1BD12BDD90A9 () BYAPR06MB5352 ! namprd06 ! prod ! outlook ! com
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Hello,
In the paper below, the authors say that they have set up their USRP device=
to include timestamps for each recorded sample, but do not provide detail =
on how this was achieved:
https://ieeexplore.ieee.org/document/6533293
I have been looking into what is required to achieve something similar. Par=
ticularly, I have been working with the source code of the rx_timed_samples=
.cpp example provided in the UHD files, along with this page in the Ettus m=
anual:
https://files.ettus.com/manual/page_sync.html
Looking through the rx_timed_samples code, it appears that the metadata ass=
ociated with the recv(..) function contains a time_spec field which is the =
timestamp for the first sample in the IO stream, but it's not immediately c=
lear to me how that might be used to timestamp all of the samples, which ma=
kes me think this may be the wrong approach. Is there a simpler method to d=
o this that is known?
Tangentially, I've also looked into adding the timestamps through GNURadio,=
but there does not appear to be a way to do this as far as I can tell.
Any help is much appreciated.
Thank you,
Alex
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<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In the paper below, the authors say that they have set up their \
USRP device to include timestamps for each recorded sample, but do not provide detail \
on how this was achieved:<o:p></o:p></p> <p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a \
href="https://ieeexplore.ieee.org/document/6533293">https://ieeexplore.ieee.org/document/6533293</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have been looking into what is required to achieve something \
similar. Particularly, I have been working with the source code of the \
rx_timed_samples.cpp example provided in the UHD files, along with this page in the \
Ettus manual:<o:p></o:p></p> <p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a \
href="https://files.ettus.com/manual/page_sync.html">https://files.ettus.com/manual/page_sync.html</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Looking through the rx_timed_samples code, it appears that the \
metadata associated with the recv(..) function contains a time_spec field which is \
the timestamp for the first sample in the IO stream, but it’s not immediately \
clear to me how that might be used to timestamp all of the samples, which makes me \
think this may be the wrong approach. Is there a simpler method to do this that is \
known? <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Tangentially, I’ve also looked into adding the timestamps \
through GNURadio, but there does not appear to be a way to do this as far as I can \
tell.<o:p></o:p></p> <p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any help is much appreciated. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you,<o:p></o:p></p>
<p class="MsoNormal">Alex<o:p></o:p></p>
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