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AWRL6432: Automotive Radar Sensor pass though tinted glass of back window

Yoong KC
Prodigy 20 points
Part Number: AWRL6432
Other Parts Discussed in Thread: AWR6843, AWRL6844

Tool/software:

Hi, 

Currently, we have a project required install the distance sensor inside vehicle, we have tested with LiDAR sensor on back window with tinted glass but it is unable to pass thought on it.

I found some study on TI development webpage, the result show radar can pass though with glass but the glass is not tinted.

website: https://dev.ti.com/tirex/explore/node?a=1AslXXD__1.30.00.05&node=A__ADM50lHnky.ughJQEigzxA__radar_toolbox__1AslXXD__1.30.00.05

Can I know the RADAR sensor is able to pass though tinted glass of back window? 

If able pass though on tinted glass, do you have any recommended model of radar sensor?

Thank you.

Best Regard,

KC Yoong

  • 0
    TI__Mastermind 36505 points

    Hi, there:

    Yes, radar should be able to pass through tinted window.  To choose the device and EVM (antenna), you may need to answer several questions

    1) RF frequency (77G or 60G)

    2) How heavy will be the signal chain? (DSP or not DSP)

    3) Is Low power critical to your application? (Battary-based solution?)

    4) Do you need to cover wide field of view (FOV) on both azimuth and elevation direction?

    5) Do you need high angle resolution (how many antenna you will need)? 

    Best,

    Zigang

  • 0 in reply to zigang Yang
    Prodigy 20 points

    1) RF frequency (77G or 60G)

    -> Both also accepted, if can penetrate tinted glass.

    2) How heavy will be the signal chain? (DSP or not DSP)

    -> Not sure, it is used inside vehicle to detect outside vehicle.

    3) Is Low power critical to your application? (Battery-based solution?)

    -> Yes, the project is used car battery.

    4) Do you need to cover wide field of view (FOV) on both azimuth and elevation direction?

    -> 120 degree.

    5) Do you need high angle resolution ?

    -> can i know more for high angle resolution ? 

    6) how many antenna you will need? 

    -> should be 3 antenna to avoid false detection

  • 0
    Prodigy 20 points

    I found the vehicle tinted glass have 5 major materials 

    1. Dyed Window Tint Film - Polyester with dye
    2. Metalized Window Tint Film - Polyester with embedded metallic particles (aluminum, nickel-chrome)
    3. Hybrid Window Tint Film - Combination of dyed and metalized layers
    4. Carbon Window Tint Film - Polyester with carbon particles
    5. Ceramic Window Tint Film - Ceramic particles embedded in polyester

    The tinted glass also have different visible light transmission. According rule of Malaysia Transport, the VLT of back window can be any percentage.

    Can I know the performance of radar sensor pass though these tinted materials?

    How the visible light transmission (VLT) affect the performance of radar sensor? 

  • 0 in reply to Yoong KC
    TI__Mastermind 36505 points

    Hi, there:

    You can start with AWRL6432 EVM or AWR6843ISK-ODS board.  AWRL6432 is low power and cheap antenna material (lower antenna gain).  You can expect higher performance with AWR6843.    TI's new low power device AWRL6844 is in verification stage, and will release in early next year.   

    I strongly recommend you to start with AWR6843 to try the performance.  And see whether you have performance margin to go with cheaper device.  If you do not have performance margin, then you can go with AWRL6844 later on. 

    Best,

    Zigang 

  • 0 in reply to Yoong KC
    TI__Mastermind 36505 points

    Hi, there:

    You will have to try on your side to verify.  We won't have an answer for you. 

    Best,

    Zigang