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IWR1443BOOST: differentiate between water and solid objects

jason Anderson
Expert 1080 points
Part Number: IWR1443BOOST

Hi,

I am using the high accuracy lab for measuring distance to closest object. How do i "See" the difference between a solid object and between water. I want to know to calibrate the sensor as i have different applications for it.

How do i get to calibrating the sensor anyway? which parameter is about the object it sees?

I do not want to do this by setting a pre-determend distance.

How do i achieve this?

cheers

  • 0
    TI__Genius 11405 points
    For the high accuracy lab and the default chirp config, there is no parameter related to the object to be detected. The different reflection coefficient or radar cross section (RCS) of difference material/objects affect the max detectable distance and the accuracy. However, the range value under detectable range should not depend on the type of objects, assuming flat surface and no surrounding objects to interfere the reflection.

    As for the calibration you mentioned, do you mean the cli command implemented in the mmw demo? The offset is due to antenna, not due to the object under detection. In high accuracy lab, it is not implemented yet. However, you can set a fixed distance and run the measurement. Later apply the offset in your measurement.

    Regards,
    Michelle
  • 0 in reply to Michelle Liu
    Expert 1080 points
    Hi,
    How do i set the RCS for mm precision accuracy? And to which value?

    yes for the calibration i ment the cli commands. What is this offset you mean? the 3 cm minimum distance? I do get a 7 cm higher measurement than i expect. Why is this offset there?
  • 0 in reply to jason Anderson
    TI__Genius 11405 points
    Hi,

    RCS is a property of the object under detection, not an input parameter into cli config. For example, slab of plate has much higher RCS than a cardboard. There is also corner reflector sold on market with specified RCS value.

    The offset typically is 7-8 cm. The value you got is the offset and can be extracted from measurement.

    Thanks and Regards,
    Michelle
  • 0 in reply to Michelle Liu
    Expert 1080 points

    7-8 cm? i need mm accuracy. How do i achieve this best if u give me a offset range instead of an exact offset?

    can i remove this offset before the UART stream? so just delete the entire offset occurance?

    cheers

  • 0 in reply to jason Anderson
    TI__Genius 11405 points
    The offset given was for a general case for all the EVMs. The calibration step needs to be taken to get the exact value for the test.
    For example, you can put flat metal slab at 1m away, then what you read from the test can be compared with 1m and offset is calculated.
    Then you can apply that offset in your future test.

    Thanks and Regards,
    Michelle
  • 0 in reply to Michelle Liu
    Expert 1080 points
    Can the offset be applied via parameters in high accuracy lab? or should i just adjust the output via an script? i would prefer to do it without an external script.
  • 0 in reply to jason Anderson
    TI__Genius 11405 points
    Sorry, it is not implemented in the current high accuracy lab. External script is needed.

    Regards,
    Michelle