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Original question:

DCA1000EVM: mmWave Studio 2.0.0.2

DCA1000EVM: mmWave Studio 2.0.0.2

Anthony Pesin
Intellectual 600 points
Part Number: DCA1000EVM

Dear Technical Support,

I am recording ADC files with DCA1000 in Sensor mode (FMCW). 

I have setup samplingRate = 3000kSps, Number of Tx = 1, Number of Rx = 1, Number of chirps = 11, Number of ADC per chirp = 2664, Number of ADC bits = 16, Number of frames = 200 with frame periodicity = 50ms.

I am expecting a 10s duration file (200 frames x 50ms) and a total number of ADC samples = 3000k x 10 = 30 000k = 30M.

The resulting file is of size = 23 443 200 bytes  leading to 23 443 200 x 8 / 16  / 2 = 5 860 800 samples leading to 5 860 800 / 3 000 000 = 1.95s instead of 10s as expected.

Please could you help me in finding the issue?

I thank you for your support.

Best regards. 

Anthony.

  • 0
    TI__Guru 69990 points

    Hi Anthony,

    Did you try plotting the captured data with mmWave Studio-> PostProc?

    And do you always see this less size of the captured file with DCA1000 even with different configurations?

    Regards,

    Jitendra

  • 0 in reply to Jitendra Gupta
    Intellectual 600 points

    Hi Jitendra,

    Thanks for your reply.

    Yes I tried to plot the captures data using "mmWave Studio -> PostProc". I understand I can plot the ADC samples in time domain of only one chirp of one frame at a time.

    There is also an animation to show the ADC samples for all frames versus time.

    My question is: is the animation plotting all the chirps of all the frames or only one chirp for all the frames? I am confused with the ability to set the number of chirps when I click on the play button.

    Here is what I want to do: I am trying to plot all the chirps of all the frames to extend the time axis to the total duration time of the recorded file which I want to set to a 10s capture for my use case. For that, I need to be sure to understand correclty what is displayed in this animation and why there is a mismatch between the expected time duration and the actually recorded time duration.

    I thank you for your support.

    Best regards.

    Anthony.

  • 0 in reply to Anthony Pesin
    TI__Mastermind 40695 points

    HI, Anthony:

    Your file size looks perfect to me, the size should be:

    numADCSamples * 4 * numTXAnt * numRXAnt * numChirp * numFrames  = 2664 * 4 * 11 * 200 = 23443200 byte

    We times 4 above is because every ADC sample have 16 bit I and 16 bit Q, a total of 4 byte. 

    Best,

    Zigang