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AWR1642: The mmWare studio contstream can't work well

user4546138
Prodigy 60 points
Part Number:

Hi, 

Is the "Contstream" mode in the mmware studio can't work well. 

I can step by step run: Connection --> StaticConfig  --> DataConfig --> ContStream-->Capture-->Stop Capture--> Display

All status is passed.But the transmit antenna doesn't seem to be enabled and the captured data look like noise

So how can I use CW mode to get the right echo data

Thanks!

  • 0
    Prodigy 60 points

    user4546138 said:

    Part Number: AWR1642

    Hi, 

    Is the "Contstream" mode in the mmware studio can't work well. 

    I can step by step run: Connection --> StaticConfig  --> DataConfig --> ContStream-->Capture-->Stop Capture--> Display

    All status is passed.But the transmit antenna doesn't seem to be enabled and the captured data look like noise

    So how can I use CW mode to get the right echo data

    Thanks!

  • 0
    TI__Genius 14645 points

    Hi,

    Could you help us understand your use-case a little?

    Continuous streaming mode is usually meant for RF lab characterization and is not normally used for functional distance measurements. Are you attempting to do some characterization measurements, or are you attempting to do functional measurements?

    Best Regards,

    Anand

  • 0 in reply to Anand Gadiyar
    Prodigy 60 points

    I just want to use continuous waves to measure velocity.

    I don't care the distance and just need Doppler frequency

    Thanks for your reply

  • 0 in reply to Anand Gadiyar
    Prodigy 60 points

    My settings and the captured data are shown in the figure below

    The captured data look like noise.

    The txEnable in Programmed Parameters is 0 0 0 .It seems that the transmitting antenna is not working, only the receiving antenna is working

    So how can I enable the tx?

  • 0 in reply to user4546138
    TI__Genius 14645 points

    Hi,

    Then you should not be using continuous wave mode. You may want to use functional chirps configured using the Sensor Config tab instead.

    Best Regards,

    Anand

  • 0 in reply to Anand Gadiyar
    Prodigy 60 points

    Thanks for your reply!

    So I need additional configuration to implement the ContStream function?

    Or the ContStream mode does not support single frequency continuous wave to realize the function I want (get the Doppler frequency)?

    If I can't use ContStream tab to transmit single frequency continuous wave.

    Then how to configure the single frequency continuous wave mode in the Sensor Config tab

    Best Regards

  • 0 in reply to user4546138
    TI__Genius 14645 points

    Hi,

    The CW mode does transmit at a single frequency continuously. The enabled transmitters are controlled using the settings in the StaticConfig tab in mmWaveStudio.

    However, your captures will look like noise because the slope is 0, and everything will be seen at DC. So the behavior you are reporting is expected.

    I'm afraid we still do not understand what you are trying to do. Please note that our devices are only meant for FMCW radar, where you would normally configure multiple like chirps and use the phase shift across the chirps to measure velocity.

    Best Regards,

    Anand

  • 0 in reply to Anand Gadiyar
    Prodigy 60 points

    I know the slope is 0 when target is stationary.

    I think the slope ( frequency of captured data ) should be Doppler Frequency when I detect moving objects. 

    Is that right?

    But the slope still is 0 when I use Continuous Wave to detect some target with velocity ?

  • 0 in reply to user4546138
    TI__Genius 14645 points

    Hi,

    This is not correct. The reflected signal and the mixed LO signal will be of the same frequency, so the resulting IF signal will be at DC.

    You might want to review the FMCW radar trainings from here:

    Best Regards,

    Anand