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

Sammy Welschen sammywelschen at gmail.com
Sat Jan 25 11:43:50 EST 2020


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
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