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CCS/IWR1642: How to cancel the velocity disambiguation function in SRR demo

Part Number: IWR1642

Tool/software: Code Composer Studio

Hello, i wanna cancel the velocity disambiguation function in SRR demo because i wil use it in a low speed scene. As we know there are two subframes in SRR demo. One is srr, another is usrr. Now i only use srr frame and want to cancel its velocity disambiguation function realized by chinese remainder theorem. First i cancel srr1 chirp as picture below. Then i change some related variables like "numChirpTypes",  ''SUBFRAME_SRR_NUM_CHIRPTYPES" and so on.

I rebuild the project and burn it to radar, but the result looks so weird. Radar can detect target correctly, but meanwhile it also detect so much noise points. In the picture, red circle is the ceiling of room. Blue circle is noise points, and they will get closer and closer to the origin of the coordinates, then jump back to the radar maximal detection range, and then continue to approach the origin of the coordinates, repeating.

What's the correct way to cancel the velocity disambiguation function? Looking forward to your response.

  • Hi,

    If you are using the algorithm at slow speed, the disambiguation should have no impact.

    The demo you are using has been optimized for a specific use case.

    You may want to consider a different demo such as the mmWave SDK demo if you do not need velocity extension

    thank you

    Cesar

  • I did a test of SRR demo after I slightly reduce CFAR threshold, and there are some wrong trackers with wrong detected speed. All of these wrong speed are more than maximal unambiguous speed. So actually disambiguation have some impact at slow speed. I will use radar on uav, so i need a detection zone around 80m, and uav has flexible speed. Thus i think the most appropriate demo is SRR. By the way, cancel 64 slow chirp(srr1 chirp) can also reduce power of radar.

    So i indeed need to cancel the disambiguation in SRR demo. Would you mind give me some advice on how to change the code?

  • Hi,

    We need to check if original developer can provide any assistance

    Will probably be able to get back to you next week.

    thank you

    Cesar

  • Hi,

    Unfortunately I was not able to contact the original developer.

    I will check again and will get back to you later this week

    thank you
    Cesar

  • Hi,

    I was finally able to contact the developer.

    He mentioned that it will not be possible to remove the disambiguation without completely modifying the code.

    Would it be possible to use a different demo for your project?

    thank you

    Cesar