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IWR1443: mmwave basic question

Kz777
Expert 7895 points
Part Number: IWR1443

Hi Champs,

We have couple of questions.

1: If  the object 's dielectric constant value close to "1", is this not able to detect due to "No reflection" ?

2:  If the object's dielectric constant value is much huge value,  does it "Not" detect due to RX antenna angle ?

     (i.e. if some aluminum plate till up to 45 degree toward sky , reflect signal didn't go back to RX antenna stately.)

3: Do you have any dielectric constant target list against 77GHZ  other than "swra593" document ?

4: Regarding "swra593" document, this mention RCS (Radar cross section) words. What is this "cross" indicate against and its meaning ?

5:Regarding this mmwave fundamental document 

http://www.ti.com/lit/wp/spyy005/spyy005.pdf

It mentioned angle detection. This document didn't mention why do we need multiple TX ?

because, it detect angle using one TX against multiple RX phase difference.

Regards,

Kz777

  • 0
    TI__Expert 4025 points
    Hello,

    I am looking into this and will get back to you shortly.

    -Chloe
  • 0
    TI__Expert 4025 points

    1) Air has a dielectric constant of 1.  Objects generally have much larger dielectric constants than air, so this is not an issue.  

    2)There will still be reflections even if the object is angled.

    3) I'm not sure what you mean by this question.

    4) A radar cross section is a measure of the ability of the target to reflect radar signals in the direction of the radar receiver. A greater RCS indicates greater ability to be detected for a given radar sensor system. An item with a higher RCS can be detected at further ranges.

    Please watch our training videos for more information.

    -Chloe

  • 0 in reply to Chloe Shay71
    TI__Expert 7895 points
    Hi Chloe,
    Thanks.

    *Regarding No3 question, this dielectric constant material list for radar detection. Do you have such a list ?

    *Could you please check No5 question ?
  • 0 in reply to Kz777
    TI__Expert 4025 points

    Hello,

    3)  The app note you're referencing shows some examples of object range detection.  If you're wanting to find values of dielectric constants of different materials, these can be found online.

    5) Please see section 2.6 of the users guide and watch the training video on angle detection for more information about the Rx/Tx antennas.

    -Chloe