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IWR1443BOOST: Coordinate system origin and issue when objects are close to the radar

Humberto Fernandez
Prodigy 135 points
Part Number: IWR1443BOOST

Hello all,

I have two questions related to the IWR1443BOOST radar.

1) The radar provides an x, y, z point cloud. I was wondering which is the coordinate system origin. I think that it depends on the number of antennas under consideration. I would like to know if there is a way to compute this centre for different antennas configuration.

2) The radar suffer from an issue when an object is very close to it. In this case, no data is received. Is there any solution for that?.

Thanks.

  • 0
    TI__Guru 50240 points

    Hi Humberto,

    I've asked an expert to look into this and we should have an answer for you in the next few days.

     

    Cheers,

    Akash

  • Former Member
    0 Former Member

    Hello Humberto,

    1) You can estimate the origin as the center between the transmitters and receivers in use. However, you could also put an object at a known position relative to the EVM and then determine the offset from the measured reading and the known position. This would be your calibration offset for XYZ.

    2) What do you mean by no data is received? Is the device running but you see no point cloud or is the device crashing?

    Amanda

  • 0 in reply to Former Member
    Prodigy 135 points

    Hi

    Ok, thanks for your quick answer to the first question.

    Regarding the second one. No data is received by the Data_port when doing the following calling in Python "Dataport.read(Dataport.in_waiting)". I tested my program when no object is very close to it and it works fine and the radar provides the correct data, but when an object is very close, almost touching the radar, no data is received.

    By the way, I have to buy a longer USB to micro USB to connect a raspberry to the radar. Are there any specifications that should accomplish?. Could you recommend me one?.

    Thanks a lot.

  • Former Member
    0 Former Member in reply to Humberto Fernandez

    If you remove the object away from the sensor after bringing it close does the sensor recover and continue to output data?

    Generally there are standards that prescribe the maximum USB cable length but I haven't had issues using this one: https://www.amazon.com/gp/product/B00C7S2FRE/ @ 10ft. I would think most USB extension cables should be ok considering the data rate of the demo.

    Amanda

  • 0 in reply to Former Member
    Prodigy 135 points

    Sometimes the sensor recovers and sometimes not.

  • Former Member
    0 Former Member in reply to Humberto Fernandez

    If the device is crashing, I think likely what's occurring is when you place an object too close to the sensor you get too many points and then can run into timing issue for the UART output. You can try to reduce this issue by changing the CFAR threshold so that you get less points, enabling peak grouping so that you get less points, or increasing your frame period to enable more time for UART output.

    Also please note that the range resolution of the device is ~4CM so it is not possible to resolve points within a 4CM range.

    Amanda

  • 0 in reply to Former Member
    Prodigy 135 points

    Many thanks for the info.