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

Simon, 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. Cheers, Martin 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 > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >