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CCS/IWR6843ISK: IWR6843：Extended maximum velocity question

user4542591
Prodigy 240 points
Part Number: IWR6843ISK

Tool/software: Code Composer Studio

Hi TI experts，

When we use the speed expansion algorithm，There are some problems，

D:/ti/mmwave_sdk_03_03_00_03/packages/ti/datapath/dpc/dpu/aoaproc/docs/doxygen/html/index.html，

the extended maximum velocity feature section，

Place a corner reflector in front of the radar antenna board，When the antenna board shakes randomly，

Some target points detected have speed，and the speed value is relatively large，but there is no moving targets，

How to eliminate the speed of static target point ？

many thanks ！

  • 0
    TI__Mastermind 30405 points

    Hello,

    Please help me understand your question better. Are you saying that you intentionally shake the board when measuring a static target? Any movement of the board (shaking or otherwise) results in relative motion between the sensor and target(s) in the scene. This  will result in the detection of moving targets as expected. I'm not sure about the goal of your test.

    Regards

    -Nitin

     

  • 0 in reply to Nitin Sakhuja
    Prodigy 240 points

    Hi，Nitin，

    Schematic diagram of experimental device as follow，

    The antenna board consists of three transmit antennas to form a uniform linear array and four receive antennas to form a uniform linear array.

    When the wind blows or random shaking the antenna board，but the corner reflecttor is stationary，

    For the detected target points, the speed of some target points is 0, and the speed of some target points is greater than 0，

    all the target points’  speed is 0 as expected.

    the extended maximum velocity algorithm is described in the document，

    D:/ti/mmwave_sdk_03_03_00_03/packages/ti/datapath/dpc/dpu/aoaproc/docs/doxygen/html/index.html，

     

    How to eliminate the influence of random jitter on radar detection target ？


    Look forward to your

  • 0 in reply to user4542591
    TI__Mastermind 30405 points

    Hello,

    As noted below, any motion of the target or board will result in detection of moving targets. This is not related to the Velocity extension algorithm, which is meant to correct for the aliasing (rollover) of velocity if the target is moving faster than the maximum velocity supported by the particular chirp configuration. You can indeed disable velocity extension by disabling it in the configuration file as shown in the SDK user guide (snapshot below).

    One way to reduce the effect of random motion, would be to reduce the velocity resolution in your chirp configuration. You can use the mmw demo and use the slider controls provided in the mmWave Demo Visualizer to reduce (i.e. make it coarser, so a larger physical value means lower velocity resolution) the velocity resolution and see if the effects of jitter are reduced. 

     

    Regards

    -Nitin