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IWR6843: mmWave Radar IWR1843 and IWR6843.

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Genius 11020 points
Part Number: IWR6843
Other Parts Discussed in Thread: IWR1843, , AWR1843, IWR1843BOOST

Dear team,

I have some questions about the mmWave Radar IWR1843 and IWR6843.

1. Since I am working on enabling beamforming for the radar, I am looking for a way how to test or visualize the radiation pattern after adjusting the phase shifter of the radar. I found this link:

dev.ti.com/.../node

It shows the E-plane cut in the radiation pattern. So, I am wondering how to draw this kind of figure using the Matlab tools, can you please advise it in detail?

2. If we take a closer look at the TX and RX antennas, for example, IWR1843, we can see there are 3 TXs but each of them seems to have 3 antennas as a linear antenna array. I am not sure if I get something wrong, but if so, that means we could only config each linear antenna array as a TX, right? And each linear antenna array already managed for a main lobe of the beamforming as default, and we couldn't config each antenna in the array, respectively, correct?

I also found this document to introduce the beamforming ability on the IWR1843, please see figure 7 in the attached files. It shows the Beamforming Operation in the AWR1843, but can you please advise how to config it in detail. Also, it seems there is a tiny time interval between each TX when sending a chirp (I attached the figure for sending a chirp in the SDK document, and we can see there is a gap between the Chirp Cycle Time and the Transmitter is ON). If so, how could we enable the beamforming? Or, each TX can be managed to sync the sending without the time interval?

3. I found there was a demo for outdoor people tracking as below:

dev.ti.com/.../node

This demo shows the detection distance of the IWR6843 is up to 100m, but what is the maximum detection distance for the IWR6843? Since the IWR6843 is 60GHz, while the IWR1843 is up to 80GHz. What about the maximum detection distance of the IWR1843? Do you have any experiments to test the feasibility of using IWR1843 to detect long-range activity?

Beamsteering for Corner Radar Reference Design.pdf


Many thanks for your support!

Kind regards,
Yu

  • 0
    TI__Mastermind 23725 points

    Hello

    For #1 -> you would have to use the HW/Antenna simulation tools, in case you are asking about the radiation patterns with/without beam forming.

    For #2 -> Please look up concepts of Antenna radiations and effect of multiple arrays. The simpler version of the document for specific antenna is provided in long ragne people counting guide.

    For #3 - Measurements provided as part of the lab were done on IWR6843 ISK evm.  Please feel free to try it on IWR1843Boost with correct compiled libs.

    Thank you,

    Vaibhav

  • 0 in reply to Vaibhav Mahimkar
    TI__Prodigy 260 points

    Hi 

    Thanks for your feedback, and I still have some questions.
    For #1 -> I used the Antenna simulation tools in Matlab 2021b, but I am not sure if the HW/Antenna simulation tools are the same one? Also, I tried to simulate 3 antennas with a 60GHz frequency, but my Macbook couldn't show the pattern due to the massive computation for 3D building. So, do the HW/Antenna simulation tools work well for showing radiation patterns with high frequency?

    For #2 -> I have read some documents about the effect of multiple antenna arrays and beamforming, but I am wondering how to simultaneously enable 3 TXs to achieve beamforming on IWR1843Boost. I found a document about enabling beamforming on IWR6843 ISK as attached. So, I am wondering if the config on IWR1843Boost will be same with the IWR6843 ISK?

    For #3 -> I found one of the results from TI that IWR6843 ISK can detect people up to 98m, while IWR1843Boost can do up to 37m. So, IWR6843 ISK works better for long-distance detection.
    -
    Many thanks for that.

  • 0 in reply to Jian Xiule
    TI__Mastermind 33805 points
    Jian Xiule said:
    Also, I tried to simulate 3 antennas with a 60GHz frequency, but my Macbook couldn't show the pattern due to the massive computation for 3D building. So, do the HW/Antenna simulation tools work well for showing radiation patterns with high frequency?

    Yes, Like you noticed depending on your simulation it requires a lot of computation power

    Jian Xiule said:
    I am wondering how to simultaneously enable 3 TXs to achieve beamforming on IWR1843Boost. I found a document about enabling beamforming on IWR6843 ISK as attached. So, I am wondering if the config on IWR1843Boost will be same with the IWR6843 ISK?

    the way to enable it is similar but you need to account for the difference in antenna configuration and frequency of operation so its not exact same configuration

    Jian Xiule said:
    I found one of the results from TI that IWR6843 ISK can detect people up to 98m, while IWR1843Boost can do up to 37m. So, IWR6843 ISK works better for long-distance detection.

    What result is this you are referring to?

    Regards,

    Charles O

  • 0 in reply to Charles Oladimeji
    TI__Prodigy 260 points

    Hi 

    Thanks for that, and below is the reply to your question.
    -
    What result is this you are referring to?
    --- I am wondering what is the maximum detection distance for IWR6843 and IWR1843 from my first question 3, and I found the results from this link (Table 3: Antenna database) which tests the maximum distance for detecting people:
    https://www.ti.com/sensors/mmwave-radar/industrial/applications/applications.html

    Anyway, thanks for your reply

  • 0 in reply to Jian Xiule
    TI__Mastermind 33805 points

    Hi,

    The maximum distance depends on the configuration. what is the application you are interested in?

    Regards,

    Charles O

  • 0 in reply to Charles Oladimeji
    TI__Prodigy 260 points

    Hi 

    I am interested in the long distance people or moving object detection. So, I would like to understand the maximum detection distance offered by IWR6843 and IWR1843.

    Before this idea, I thought to enable the beamforming of IWR1843 to detect a moving object with a tiny motion target in a short distance (<5m indoor), e.g., detecting the speaking area (throat and lip) while walking around the sensor. Using beamforming may focus on an area to avoid motion noise, but it seems the current IWR1843 may not be able to enable sufficient narrow beam (small FOV of the main lobe) to avoid ambient noise. Based on my experiments, I found the coverage of IWR1843 is quite large, and I don't think even enabling 3 TXs simultaneously could largely reduce the coverage. Do you have any advice for this limitation?

  • +1 in reply to Jian Xiule
    TI__Mastermind 33805 points

    Hi,

    I recommend focusing on throat lip motion detection first, I don't think the single chip solution is capable of such resolution. You may need to look at cascade application for this.

    Regards,

    Charles O