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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