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IWR6843AOP: Why the antPhaseRot setting for IWR6843AOP is different in 3D ppl and overhead ppl?

Chris Meng
Mastermind 37726 points
Part Number: IWR6843AOP

Hi,

I found the antPhaseRot setting for IWR6843AOP is different in 3D ppl and overhead ppl. Would you pls kindly advise why?

C:\ti\mmwave_industrial_toolbox_4_6_0\labs\people_counting\68xx_3D_people_counting\chirp_configs\AOP_6m_default.cfg

antPhaseRot 1 -1 1 -1 1 -1 1 -1 1 -1 1 -1

C:\ti\mmwave_industrial_toolbox_4_6_0\labs\people_counting\overhead_3d_people_counting\chirp_configs\pc_6843_3d_aop_overhead_3m_radial.cfg

antPhaseRot -1 1 -1 1 -1 1 -1 1 -1 1 -1 1

I checked the 3.3.2. Antenna Phase Rotation Configuration of 3D_people_counting_detection_layer_tuning_guide.pdf, but I am still not clear how to set antPhaseRot. Would you pls kindly explain more?

  • 0
    TI__Genius 14415 points

    Hi Chris,

    Those two commands are actually equivalent to each other. Since it is saying ant 0 and 1 have a phase shift from eachother, it doesn't matter whether the negative is in the ant0 or ant1 position.

    This antPhaseRot parameter is fixed by the antenna design, so should not need to be reset for any of the EVMs.  In the detection layer tuning guide, it suggests to use the below config for AOP, but both are equivalent.

    antPhaseRot -1 1 -1 1 -1 1 -1 1 -1 1 -1 1

    Regards,

    Jackson