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IWR6843ISK-ODS: MMWAVEICBOOST

Srinivas S L
Prodigy 135 points
Part Number: IWR6843ISK-ODS
Other Parts Discussed in Thread: IWR6843, MMWAVEICBOOST,

Hi,

   Request advise on the following points

1. For IWR6843 what are the maximum and minimum value of S (slope of the f-t curve).

2. For IWR6843 what are the maximum and minimum value of Tc (Time observation window of the f-t curve).

3. Is it feasible to measure 1-10 micro-meter water surface vibration using IWR6843. I have IWR6843ISK-ODS and MMWAVEICBOOST available with me to try out. I worked out the calculations for Delta_pi as shown in the Video 1.2 of Intro to mmwave FMCW radar, it is coming to 0.144 deg for 1 micro-meter. Kindly advise on feasibility or things that needed to be done to achieve this.

Thanks.

  • 0
    TI__Mastermind 37805 points

    Hi Srinivas,

    You can see these values in the SDK documentation here under the profileCfg section. But they don't explicitly answer your question here

    mmwave_sdk_user_guide.pdf

    Srinivas S L said:
    1. For IWR6843 what are the maximum and minimum value of S (slope of the f-t curve).

    The maximum and minimum values of S depend on the chirp time. The overall bandwidth of the chirp cannot go outside 60-64 GHz. So if the slope and chirp time yield a combination that outside of this bound, then it will not work.

    Srinivas S L said:

    2. For IWR6843 what are the maximum and minimum value of Tc (Time observation window of the f-t curve).

    See answer above.

    Srinivas S L said:

    3. Is it feasible to measure 1-10 micro-meter water surface vibration using IWR6843. I have IWR6843ISK-ODS and MMWAVEICBOOST available with me to try out. I worked out the calculations for Delta_pi as shown in the Video 1.2 of Intro to mmwave FMCW radar, it is coming to 0.144 deg for 1 micro-meter. Kindly advise on feasibility or things that needed to be done to achieve this.

    Looping in a colleague to comment.

    Best,

    Nate

  • 0 in reply to Nathan Block
    TI__Genius 17265 points

    Hi,

    We have not done any testing on such a usecase. While the range resolution is certainly not that small (best we have gotten is ~1mm level accuracy using zoom FFT method), you may be able to measure the vibration using micro-doppler information. I would recommend you capture raw ADC data for this use case and do some offline processing of this data in order to determine whether the results you are looking for are in fact feasible. 

    Best Regards,
    Alec