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IWR1443: About the measurement accuracy in TIDEP-0091 level_sense_demo

user1213293
Prodigy 170 points
Part Number: IWR1443
Other Parts Discussed in Thread: TIDEP-0091,

In TIDEP-0091，IWR1443Boost is power-cycled by MSP432lLaunchpad。

We change frameCfg->numFrames to 0, and add demo_config1D_HWA(dataPathObj); demo_dataPathTrigger1D(dataPathObj); at the end of every measurement,
so the software continuous trigger the IWR1443Boost without MSP432Launchpad.
We also enable RUN_FULL_CAL.

We also designed a PTFE lens for iwr1443.

We use the profileCfg and frameCfg paremeters from sprcah9 Chirp Budget Calc_09_25_18.

It can not get the distance when the target is more than 20 meters using DEMO_CONFIG30.

It can get all the distance when using DEMO_CONFIG75, but the accuracy is very poor. The measuring error is about 1 meter at 50 meters range, 1.5meters at 60 range, more than 2 meters at 70 meters range

Please help us analyze it

  • 0
    TI__Guru 50240 points

    Hi User

    Can you confirm if you are seeing accurate values for both DEMO_CONFIG30 and DEMO_CONFIG75 in nearer range? Or is the inaccuracy consistent for different ranges tested?

    Can you share more details on the lens? What is size and focal length?

    Also does your application have specific power requirements?

    Regards,

    AG

  • 0 in reply to Akash Gondalia
    Prodigy 170 points

    1.Yes, We can get accurate values for both DEMO_CONFIG30 and DEMO_CONFIG75 in less than 10 meters, but not accurate in far range,.

    2. The diameter of the lens is 80mm, and focal length is 32mm, Beam width is 2.3° according to the  simulation。

    3. There is no  power requirements for now.

  • 0 in reply to user1213293
    TI__Guru 50240 points

    Hi User

    The Measurement Error should not be this large at all. Can you tell me more about your test setup please? Do you have pictures?

    What object are you measuring and what does your scene look like?

    Also are there results you can share?

    Regards,

    AG

  • 0 in reply to Akash Gondalia
    Prodigy 170 points

    In order to test the maximum range condition of 100m, a corner reflector was placed in a long corridor and the 80mm*32mm lens was fitted to the IWR1443. An optical distance sensor was used to verify results from the radar. Figure is a photo of the setup.

    IWR1443+80-32 lens-measuring results.docx

  • +1 in reply to user1213293
    TI__Guru 50240 points

    Hi User

    Thank you for sharing this. A few comments,

    If the lens focal length was larger this would result in greater "magnification" of the radar beam which means the accuracy would be better at further distances. The lens focal length is somewhat small which explains why there is accuracy preserved at nearer distances but less consistent at far distances. Your final design will need to account for this.

    The below image shows beam pattern with and without a lens of 4 inch (~100 mm) diameter and 151 mm focal length. The concentration of the beam is very clear.

    Also the testing area you've shown is a hallway and might not be the best testing area. The presence of walls and signs could contribute to some disturbance which compromises signal integrity. Is it possible to test this outside? I believe results will be much better and more similar to a level sensing application.

    Lastly I would recommend trying the High Accuracy Lab for IWR1443. The default configuration is good for maximum 10 meters and I can also provide a configuration for this lab with maximum of 20 meters.

    Regards,

    AG

  • 0 in reply to Akash Gondalia
    Prodigy 170 points

    We prefer 100 meters maximum range.