[USRP-users] Ettus N210 FMCW Radar

Martin Braun martin.braun at ettus.com
Thu Mar 3 13:57:28 EST 2016


You're probably using timed rx + tx to sync up 2 devices. The delay
you'll see comes from propagation delay inside the DSP chains as well as
analog propagation delay. However, it's deterministic, and you can
calibrate it away.

I did some radar work on N210s a while back, and used a reference target
at a known distance to calibrate. For a coarse estimate, you can also
use you tx/rx leakage, which should be approximately at 0 m in your
range/Doppler plot.


On 03/03/2016 03:17 AM, Simon Olvhammar via USRP-users wrote:
> Hello,
> We are currently trying to implement FMCW Radar functionality using the
> Ettus USRP N210 and LabView. We have synced RX and TX using the Start
> Trigger Time functionality in LabView. However it seems to still be a
> delay problem, and I'm suspecting a processing delay from signal
> entering RX to seeing samples at host. Are my suspicions right? Is there
> a way to eliminate this?
> Best regards
> Simon
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