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

Robert.Poehlmann at dlr.de Robert.Poehlmann at dlr.de
Mon Jan 27 08:42:11 EST 2020

We use the N310 for DoA estimation, however:

-          you are limited to 4 GHz

-          after power-cycling you get a 180° ambiguity between the two radios (I do not know if this could also happen when you just change the LO frequency)

If you want to have >4 channels, have a look at the new N320/N321. No experience with those, but apparently they can do LO distribution.

Also take into account if maybe later in the project you want to be able to transmit, which you cannot do with TwinRX.


From: USRP-users [mailto:usrp-users-bounces at lists.ettus.com] On Behalf Of Sammy Welschen via USRP-users
Sent: Monday, January 27, 2020 2:19 PM
To: usrp-users at lists.ettus.com
Subject: Re: [USRP-users] DOA with N310 or X310+TwinRX

Thank you Marcus! So the N310 would be the way to go? I was unsure since the TwinRX is recommended for phase coherent applications.

Marcus D. Leech via USRP-users <usrp-users at lists.ettus.com<mailto:usrp-users at lists.ettus.com>> schrieb am So., 26. Jan. 2020, 18:57:
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

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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