Re: [Discuss-gnuradio] Synchronizing N210 TX and RX channels

[Stefan Wunsch]

Hey Daniele,

I have done the radar toolbox and implemented a synced USRP interface
(USRP Echotimer).

You are right, the USRP Echotimer does align the timestamps of the TX/RX
commands on both USRPs. But if you connect them by MIMO, the time and
clock are pretty good in sync. Therefore I think the Echotimer can
provide a sync with an accuracy of at least +- 1 sample. Check out [0]
for a video of the sync. There is also a sync setup for testing
(gr-radar/examples/usrp). Unfortunately the documentation is not
finished yet.

But care: The Echotimer bursts only a packet in sync, it does not stream
the whole time! The packet is defined by a tagged stream.

Greetings,
Stefan

[0]
https://grradar.wordpress.com/2014/06/17/synchronisation-echotimer-usrp-interface/

Am 22.07.2014 18:40, schrieb Daniele Nicolodi:
> On 22/07/2014 18:18, Martin Braun wrote:
>> On top of what Marcus' has said,
>>
>> the gr-radar toolbox might be helpful. It has a block that takes a
>> tagged stream, and outputs a signal it acquired synchronously to the
>> transmitted one.
> 
> Thanks Martin.  This seems to imply that there is no way to actually
> synchronize the hardware, and that the synchronization can only be done
> in software aligning the timestamps of the two streams. Is that the case?
> 
> Thanks. Cheers,
> Daniele
> 
> 
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>