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IWR6843ISK: Range resolution and range accuracy of mmwave sensor

user6356280
Intellectual 315 points
Part Number: IWR6843ISK

I am considering mmwave sensor.

Sorry for the rudimentary question, but please tell us about the following question.

Q1. I know that mmwave sensor have higher range accuracy than range resolution.

However, I do not understand why the range accuracy is higher than the drange resolution.

Could you please explain the principle?

Q2. If I want to improve the range resolution, which parameter of the chirp should I change?

And if I change that parameter, what performance will be reduced instead?

Q3. If I want to improve the range accuracy, which parameter of the chirp should I change?

And if I change that parameter, what performance will be reduced instead?

Best Regards,

  • 0
    TI__Mastermind 37780 points

    Hi.

    Range resolution is the ability to distinguish between two objects spaced next to one another. Range accuracy is the ability to locate a single object's position in space. While technically the distance cited for range accuracy is higher than the distance for range resolution, it's not really meaningful to compare one against the other since they refer to different characteristics.

    If you want to improve range resolution, you should increase the number of ADC samples in your chirp.

    If you want to improve range accuracy, you should use a very fine range resolution, and you should also make sure you're doing interpolation in the range dimension. Range resolution can limit range accuracy if your device is only reporting peaks based off the range FFT indices. When you interpolate, you are able to find true peaks (which correspond to locations) with greater accuracy.

    Best,

    Nate