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AWR1642BOOST: Measuring displacement changes at close distance of 1.0m

Jonathan Ibera
Prodigy 200 points
Part Number: AWR1642BOOST

1) We are trying to measure very small displacement (around 1mm) of a target that is quite close (1meter) to the radar. Is there possible guidelines or issues we need to consider for this?

2) When I try to find the single target using FFT magnitude, I get very different values in magnitude. How can I make it run consistent?  Can the CalibDCRange setting help in this scenario? There is no other target except for a corner reflector at that 1m distance. 

3) Assuming the distance bin won't change, we measure the phase difference to denote change in distance. What if the target moves to another bin, how can I make the transition in phase a bit 'smooth' and not discontinuous?   

Thanks. 

  • 0
    TI__Guru 69990 points

    Hi Jonathan,

    I would recommend referring our existing application (gesture) to TI-Rex which has almost the same requirement

    http://dev.ti.com/tirex/explore/node?node=AEMT0eKMrn-.b5lCs0dphQ__AocYeEd__LATEST

    Regards,

    Jitendra

  • 0 in reply to Jitendra Gupta
    Prodigy 200 points

    Jitendra,

    1. Thanks for sending multi-gesture reference, that can be useful in some really close target we are doing.

    2. Could the CalibDCRange still help for backgrounde environment reduction (that makes test target signal better)?

    3. As we assume it constant so we can watch the phase information, do you have any recommendation for bin changing test target? Could I do range bin combining (add the adjacent ones together) so I won't have discontinuous cut when test subject accidentally moves to another bin? 

    Thanks,

    Jonathan

  • 0 in reply to Jonathan Ibera
    TI__Guru 69990 points

    Jonathan Ibera said:
    2. Could the CalibDCRange still help for backgrounde environment reduction (that makes test target signal better)?

    yes.

    Jonathan Ibera said:
    3. As we assume it constant so we can watch the phase information, do you have any recommendation for bin changing test target? Could I do range bin combining (add the adjacent ones together) so I won't have discontinuous cut when test subject accidentally moves to another bin? 

    Please refer algorithm of other applications on TI-Rex like MRR/SRR.

    Regards,

    Jitendra