• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 30 subscribers
  • Views 491 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

IWR1642BOOST: Top down application, custom board, similar to people counting and classification application

Krishna Kumar4
Expert 1565 points
Part Number: IWR1642BOOST
Other Parts Discussed in Thread: AWR1642BOOST-ODS, IWR6843, AWR1642BOOST

I have a deployment requirement where IWR 1642 has to be mounted indoors on a ceiling facing down (maximum range is 10m). It needs to detect,classify and track objects in its field of view. The velocity of the objects will not be more than 10 Kmph.

As IWR1642BOOST antenna pattern  doesn't measure elevation, I understand when the board is mounted top down, resolution on one axis of X,Y plane is lost.

This is confirmed in this thread

https://e2e.ti.com/support/sensors/f/1023/p/749323/2770573?tisearch=e2e-quicksearch&keymatch=top%20down#2770573

However I also found a thread where by re positioning one of the Tx antenna's elevation can be measured. If simultaneous measurement of elevation and azimuth is as simple as depicted in this thread, Why is the IWR1642BOOST not having such an antenna pattern?. What will be the trade off if the Tx antenna's are positioned as per the below thread?.

Will this antenna pattern be sufficient enough for my use case of 10m range and 10Kmph velocity? For the use case, the required minimum object separation resolution is 15cm on the XY plane. Can it be achieved.

  • 0
    TI__Mastermind 39635 points
    Hi, Krishna:

    Yes, the current IWR1642Boost can only detect target in two dimension. And yes, if you change one of the TX antenna location to a different height mentioned in the thread: e2e.ti.com/.../663415, you will be able to detect target in three dimensions. But the angle resolution on azimuth direction will not be as good as the current IWR1642Boost board. It is a trade-off each users can make. But we do have AWR1642boost-ODS, with wide field-of-view (FOV) antenna evaluation module, and can detect wide angles on both azimuth and elevation directions. www.ti.com/.../awr1642boost-ods

    You can also use IWR6843, which support 3 TX antennas, and details can be found at the link below. www.ti.com/.../IWR6843

    Regarding chirp design question, Yes it is possible to cover 10m maxRange, 10kmph in max Velocity and 15cm in range resolution. The challenge will be FOV. To get to 10m range with overhead mounting, you will need to mount really high to reach 10m range within FOV.

    Best,
    Zigang
  • 0 in reply to zigang Yang
    Expert 1565 points
    Thank you for your reply, I read the tech spec of AWR1642BOOST ODS - it states that the FOV is +/- 40 degree and +/-70 degree. Doesn't it give a fov of approximately 17mx5m when mounted at a height of 3m? Am I incorrectly calculating. I just did (tan 40)x3*2 and (tan 70)x3x2 to get the 17mx5m fov area.
  • 0 in reply to Krishna Kumar4
    TI__Mastermind 39635 points
    Sometime, you can not really detect people's leg if their body is not in the FOV (leg reflection is much weaker), I would give some margin for that. But in general, your calculation is correct. Somehow, I was thinking about 15m as radius.

    Best,
    Zigang
  • 0 in reply to zigang Yang
    Expert 1565 points
    Many thanks, I am marking this thread as resolved, however I wanted to point out that I have so far received 3 e-mails (for three different queries including this one) asking me to click "this resolved my issue" and promised some shipping coupon in return. When I click "this resolved my issue", no coupon email is received. I have raised the query with customer support but they appear to be firstline support based in Philiphines who have just escalated the issue some where and it is pending for almost 15 days. As the shipping coupon e-mail is received from e2e group can you please pass this message along some where relevant to get this shipping coupon matter resolve. I have gone ahead and ordered evaluation boards as no resolution was coming through.