Other Parts Discussed in Thread: MMWAVEICBOOST
We have performed the range bias and Rx phase calibration and had results that raise some questions:
Result command : compRangeBiasAndRxChanPhase 0.1084913 0.47897 0.50790 0.58273 0.66730 0.46158 0.73132 0.35416 0.64264 0.30701 0.61652 0.35278 0.80875 0.23886 0.82465 0.15747 0.70761 0.79523 -0.08716 0.98398 -0.05927 0.99786 0.06519 0.82352 0.10553
The range bias of 10.85cm seems reasonable.
However, the phase differences between antennas seems weird. I would like to know how to interpret it.
I understand that the absolute value of the phase bias is not very meaningful (since the corner reflector could be offset by a few wavelengths). But the difference between TX/RX pairs raises some questions.
- Differences between RX antennas seem very consistent between different TX
- There is a ~50-70° phase difference between TX1 and TX3 (which are notoriously used to generate the horizontal virtual array in the ISK configuration)
- While using TX1, there is a 26° difference between RX1 and RX3 (more reasonable, but still seems quite high)
Are those values normal ? Does it mean that the calibration was not performed correctly ?
The ISK board is brand-new, plugged in to a MMWAVEICBOOST with external power. The corner reflector, on the other hand, is not ideal (it's fairly big, placed at 3m from the board).
