[USRP-users] Phase after Freq Hopping

Ian Buckley ianb at ionconcepts.com
Wed Mar 13 02:49:41 EDT 2019


> 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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