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AWR1243BOOST: Resolving two targets

Naveen kanta
Expert 1020 points
Part Number: AWR1243BOOST

Dear ,

I am using AWR1243boost with Mmwave studio to processing RAW IQ data in matlab and configured the radar with 1 Tx and 4 Rx . For the testing purpose i enable the test source to emulate the target at different positions , Velocities and signal strengths.

I understood  from the below link and documents that objects will be resolved in angle FFT. 

https://e2e.ti.com/support/sensors/f/1023/t/768283?AWR1642BOOST-Angle-resolution-object-separation-at-80-m-range-to-show-them-as-different-trackers

I agree with the point mention below and verified by the test case mentioned below 


A common case where the above assumptions fail is if the targets and the radar are both stationary. In such a case, if there are two objects at the same range (from the radar), they will remain at the same at that range indefinitely, and as such cannot be distinguished by the radar.

But please explain me why that cannot be distinguished by the radar because I have a targets as mentioned below where (RadarStudio PostProcessing matlab gui)we not able to distinguish both in angle 

target 1  x = 0 , y= 40 , vx=0 ,vy =0.9

target 2  x = 25.70 , y= 30.64 , vx=0.7 ,vy =0.7

Please explain what is happening because i am pointless and new to this post processing.

To distinguish above targets and (static) target at the same range (from the radar), they will remain at the same at that range indefinitely what kind of technique need to be adapted .

Please help me in clarifying the doubt and reply as soon as possible. 

  • 0
    TI__Mastermind 24955 points

    Naveen,

    I would suggest that you review the online mmWave Training Series on ti.com. You can find the first video in the series here: https://training.ti.com/intro-mmwave-sensing-fmcw-radars-module-1-range-estimation?cu=1128486

    For your specific question, I would suggest lesson 1.5 that discusses angle estimation. However, I think you will find it helpful to review the entire series.

    Regards,
    Kyle

  • 0 in reply to Kyle Cousino
    Expert 1020 points

    Dear ,

    You suggested me the training video but in the lecture 1.5 angle estimation module he ended up the video with the same question that I raised .......I can understand that to resolve this targets we have to increase the number of Rx antennas .......

    Check out this course on TI Training:

    My doubt is that when I emulated static targets at

    Target 1 :    x=-10 ,y=10

    Target 2 :    x=10 ,y=10

    It has to show the angle either x = 10 or -10 because it resolve one target not two but what I observe is x =0 at y=10 (results observed in Radarstudio postprocessing GUI ). So I want to know what effect the phase information which resulting x =0

    Similarly this has been done for different target case like

    Target 1 :    x=-20 ,y=20

    Target 2 :    x=20 ,y=20

    And observed X = 0 at Y=20

    Target 1 :    x=-30 ,y=30

    Target 2 :    x=30 ,y=30

    And observed X=0 at Y=30

    The actually result has to be at either of the target position but the result observed at 0 which is strange  ........As I am new to this not able to explain myself so seeking for your help in this regard

    I hope you understood my problem

  • 0 in reply to Naveen kanta
    TI__Mastermind 24955 points

    It is still not clear what you mean. In the cases you listed out:

    Target 1 :    x=-10 ,y=10

    Target 2 :    x=10 ,y=10

    Target 1 :    x=-20 ,y=20

    Target 2 :    x=20 ,y=20

    Target 1 :    x=-20 ,y=20

    Target 2 :    x=20 ,y=20

    This means that the two objects are right on top of each other. For the case where the two objects are stationary and are located in the same range bin, the two objects need to be separated by an angle determined by the angular resolution of the sensor, which is determined by the number of virtual antennas.

    Additionally, if one object has a higher RCS than the other object, the sensor may only pick up the larger RCS object.

    You can try using actual objects and see if this is the case or not.

    Regards,
    Kyle