[USRP-users] DOA with N310 or X310+TwinRX

Marcus D. Leech patchvonbraun at gmail.com
Sun Jan 26 12:56:26 EST 2020


On 01/25/2020 11:43 AM, Sammy Welschen via USRP-users wrote:
> Dear all,
>
> I am planning a system with 5-10 channels that is capable of DOA 
> estimation.
>
> Concerning the calibration of the resulting array, would there be a 
> difference between a system made up of N310 and one made up of X310 
> with TwinRX boards? Would there be other important differences that 
> influence estimation performance?
>
> As I understand it, the TwinRX allows LO sharing between the boards in 
> a single X310, but this would not help me if I have two or three X310. 
> On the other hand, the N310s could be connected to a shared LO.
>
> Are the following thoughts correct?
>
> Suppose I turn on my system. Then I have to calibrate phase offsets 
> between channels in any case. Now I change the center frequency. If I 
> have N310s without shared LO, I have to recalibrate. Same for the 
> X310s, since LOs are shared only internally. If I have N310s with a 
> shared LO, I do not have to recalibrate.
>
> If I restart the system, I have to recalibrate in any case.
>
> The devices would by synchronized with PPS in any case and with the 10 
> MHz reference if no external LO is used.
>
> What is the better choice for DOA estimation (N310 or X310 with TwinRX 
> or something different)?
>
> Thank you very much
>
> Sammy
>
>
Sammy:

Your characterization of the two scenarios is correct.

There may be some folks on this list who have implemented DOA schemes, 
but likely few-to-none who have done it on both X310 and N310
   and can comment on the differences they encountered.






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