[USRP-users] time sync 2 ettus x310

Martin Braun martin.braun at ettus.com
Mon Apr 20 18:10:48 EDT 2015


Sanjoy,

if you want to do radar, you need to make sure both devices are
connected to the same external reference. For radar, you can't run off
of separate clocks.

We've confirmed timing accuracy across devices on the nanosecond scale
in the past (using OctoClocks for clock distribution).

Cheers,
M

On 17.04.2015 06:00, Sanjoy Basak via USRP-users wrote:
> Hi all,
> I am trying to sync 2 ettus x310 in time. However, I am always having a
> distortion at the beginning after receiving, and there is always a
> delay of few microseconds between the tx and rx. I put tx in one x310
> and rx in another x310 and its in a wired connection. GPS antenna is
> connected to one usrp(with Tx) and another one is on external ref(Rx).
> 
> So now if I check the last pps on both usrp; it shows tx:0; rx:2s;
> then I am compensating it making it set_start_time both at for 4s. So
> ideally I should get time synced tx and rx signal.
> 
> But I am getting distortion in Rx signal for 2seconds at the beginning;
> this is constant for every sampling freq; so if in that region I have my
> rx signal I can't retrieve that as the distortion is already introduced
> there. 
> As I am trying to implement radar with x310, this is a serious problem
> for me. As within first 2 seconds and few microseconds I can't receive
> anything.
> 
> I would really appreciate any kind of suggestion that come through. If
> anyone have question regarding setup or python code please ask.
> Thanks for reading.
> 
> Best regards
> Sanjoy 
> 
> 
> 
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