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DCA1000EVM: Maximum size of radar data cube size that can be acquired using OOB Demo and DCA1000EVM CLI

Gayatri Menon
Intellectual 796 points
Part Number: DCA1000EVM
Other Parts Discussed in Thread: IWR6843ISK

Tool/software:

Hi.

I am using OOB Demo and DCA1000EVM CLI to acquire ADC data from TI IWR6843ISK. I am using the below configuration for the recording 

sensorStop
flushCfg
dfeDataOutputMode 1
channelCfg 15 7 0
adcCfg 2 1
adcbufCfg -1 0 1 1 1
profileCfg 0 60 10 6 128 0 0 22.595 1 366 3000 0 0 158
chirpCfg 0 0 0 0 0 0 0 1
chirpCfg 1 1 0 0 0 0 0 4
chirpCfg 2 2 0 0 0 0 0 2
frameCfg 0 2 16 0 25 1 0
lowPower 0 0
guiMonitor -1 1 1 0 0 0 1
cfarCfg -1 0 2 8 4 3 0 15 1
cfarCfg -1 1 0 4 2 3 1 15 1
multiObjBeamForming -1 1 0.5
clutterRemoval -1 0
calibDcRangeSig -1 0 -5 8 256
extendedMaxVelocity -1 0
bpmCfg -1 0 0 1
lvdsStreamCfg -1 0 1 0
compRangeBiasAndRxChanPhase 0.0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
measureRangeBiasAndRxChanPhase 0 1.5 0.2
CQRxSatMonitor 0 3 11 119 0
CQSigImgMonitor 0 99 6
analogMonitor 0 0
aoaFovCfg -1 -90 90 -90 90
cfarFovCfg -1 0 0 9.80
cfarFovCfg -1 1 -2.5 2.50
calibData 0 0 0
sensorStart
Despite configuring the recording for 20 seconds, it does not exceed 15 seconds in duration. Please refer to the CSV file generated below.
I noticed in this document (page 7): link that there is a limitation concerning the radar data cube size. Could the issue mentioned above be related to the radar data cube size for this configuration? Is the 768 kbytes mentioned in the document the size of the radar data cube per second or per single sample? What is the reason for imposing this limit?
Thanks 
Regards
Gayatri 
  • 0
    TI__Mastermind 40335 points

    HI, Gayatri:

    The radar cube size for your configuration is 384KByte based on sensing estimator. 

    1) I noticed that your frame during is tight as 25ms, you can try to increase this frame time first to see any difference. 

    2) How did you program the 20s of the capture time?   I know not all the captureStopMode in json file are actively supported in the DCA1000 CLI command. I usually use "infinite" mode and send a command below to stop capture. 

    DCA1000EVM_CLI_Control.exe stop_record xxx.json

    Best,

    Zigang

  • 0 in reply to zigang Yang
    Intellectual 796 points

    Hi,

    Increasing the frame period resolves the issue, but why is there a limit on the frame period with the OOB + CLI approach? This limitation doesn't exist with mmWave Studio. Can you provide more details on this?

    Thanks 

    Regards

    Gayati

  • +1 in reply to Gayatri Menon
    TI__Mastermind 40335 points

    Hi, Gayati:

    In the OOB demo, other than chirping, the target code need to complete the signal processing chain, which takes processing time.   While in mmWave studio, no signal processing chain is running on the device. 

    Best,

    Zigang