[USRP-users] Phase after Freq Hopping

Marcus Müller marcus.mueller at ettus.com
Thu Mar 14 05:42:43 EDT 2019


That kind would be cool ;) .
But: since this is radar, the reason for all this is probably exceeding
the Nyquist bw of the DAC with the radar wave form :(

Cheers,
Marcus

On Tue, 2019-03-12 at 23:49 -0700, Ian Buckley via USRP-users wrote:
> > On Mar 12, 2019, at 3:05 PM, Marcus D. Leech via USRP-users <
> > usrp-users at lists.ettus.com> wrote:
> > 
> > On 03/12/2019 12:49 PM, Patscheider, Dominik via USRP-users wrote:
> > > Hello ,
> > >  
> > > For a Radar I´m transmitting and receiving with the USRP X310
> > > samples on different frequency steps.
> > >  
> > > For instance, after 4 frames I´m coming back to the first center
> > > freq and continue this a few times. Hope the following
> > > description helps…
> > >  
> > > f3                   |phase4|       |…|
> > > f2                  |phase3|       |…|
> > > f1               |phase2|       |phase6|       …
> > > f0            |phase1|       |phase5|
> > >                 t ------>
> > > According to the freq adjust every frame starts with a new phase.
> > > Phase 1 ≠ Phase 5
> > >  
> > > Is there any possibility to get the same phase after returning to
> > > the same center freq? Phase 1=Phase 5, Phase 2 = Phase 6,…
> > >  
> > > Thanks in advance.
> > > dominik
> > > 
> > Almost certainly not.  It would take a very special type of
> > frequency synthesizer to achieve that.
> > 
> You mean the sort of frequency synthesizer that might be implemented
> entirely in the digital domain within say a DUC or DDC with the
> ability to have a time coordinated update to the respective phase-
> increment registers? :-)
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