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AWR2243: the 2243 cascade profileCfg parameter problem

miles meng
Intellectual 300 points
Part Number: AWR2243
Other Parts Discussed in Thread: AM2732,

Tool/software:



1. AM2732+2243 dual chip cascaded advanced frame mode (DDM); DDM
2. Parameter configuration
profileCfg 0.0000 78.0000 5.0000 5.0000 20.0000 0.0000 0.0000 11.0000 0.0000 256.0000 20000.0000 0.0000 0.0000 30.0000
profileCfg 1.0000 78.0000 5.0000 5.0000 20.0000 0.0000 0.0000 11.0000 0.0000 256.0000 20000.0000 0.0000 0.0000 30.0000
chirpCfg 0.0000 7.0000 0.0000 0.0000 0.0000 0.0000 0.0000 7.0000
chirpCfg 8.0000 15.0000 1.0000 0.0000 0.0000 0.0000 0.0000 7.0000
subFrameCfg 0.0000 0.0000 0.0000 8.0000 32.0000 200.0000 0.0000 1.0000 1.0000 200.0000
subFrameCfg 1.0000 0.0000 8.0000 8.0000 32.0000 200.0000 0.0000 1.0000 1.0000 200.0000
subDataFrameCfg 0.0000 256.0000 256.0000 1.0000
subDataFrameCfg 1.0000 256.0000 256.0000 1.0000
3. Question:
In the darkroom test, the target was at 21m, and radar RD data was collected. Using Matlab to plot, Z in the figure represents the amplitude；it was found that there was a significant difference in signal-to-noise ratio between the two sub frames; 


What is the cause and how to locate and analyze the problem

  • 0
    TI__Mastermind 21120 points

    Hi,

    Did you configure the chirps for both the devices? Are you testing with a stationary target? Since the detection is not at zero doppler bin, I think that it's a moving target. Can you perform the same experiment with stationary target? Also do the plots correspond to the subframes of a single frame or they are of different frames?

    Regards,

    Samhitha

  • 0 in reply to Samhitha Bobba
    Intellectual 300 points

    1、Did you configure the chirps for both the devices? 

    yes；

    2、Are you testing with a stationary target?

    I use the radar target simulator  to test;

    3、Since the detection is not at zero doppler bin, I think that it's a moving target. Can you perform the same experiment with stationary target?  

    I also used a stationary target for the test, and the phenomenon was the same.

    4、Also do the plots correspond to the subframes of a single frame or they are of different frames?

    In the picture above, the RD maps of subframe 1 and subframe 2 within the same frame are shown.

  • 0 in reply to miles meng
    TI__Mastermind 21120 points

    Hi Miles,

    Is the runtime calibration enabled? Can you check the behavior across all the frames? Is the signal strength different for subframe 1 and subframe 2 across the frames? Can you perform this experiment with stationary target and provide the plot to analyze the behavior across the frames?

    I hope the following documents might be helpful - Cascade Coherency and Phase Shifter Calibration and Self-Calibration of mmWave Radar Devices (Rev. C).

    Regards,

    Samhitha

  • 0 in reply to Samhitha Bobba
    Intellectual 300 points

    The picture shows the RD maps of subframe 0 and subframe 1 for stationary targets in the same frame.

  • 0 in reply to miles meng
    TI__Mastermind 21120 points

    Hi Miles,

    Samhitha Bobba said:
    Is the runtime calibration enabled? Can you check the behavior across all the frames? Is the signal strength different for subframe 1 and subframe 2 across the frames? Can you perform this experiment with stationary target and provide the plot to analyze the behavior across the frames?

    Can you check and provide the information for the above questions? As mentioned in my previous reply, can you provide the plot of signal strength of the target across all the frames?

    Regards,

    Samhitha

  • 0 in reply to Samhitha Bobba
    Intellectual 300 points

    Hi Samhitha，

    Runtime calibration is configured within the MMWave_openLink interface. Based on my understanding of the code, it appears that this runtime calibration is specifically pertinent to the AWR2243 chip and seemingly unrelated to subframe 0 and subframe 1. However, you have advised me to troubleshoot runtime calibration. Could you please provide me with a solid reason for this? I am unsure of how to proceed with the troubleshooting.

    Best Regards,

    Miles

  • 0 in reply to miles meng
    TI__Mastermind 21120 points

    Hi Miles,

    miles meng said:
    Based on my understanding of the code, it appears that this runtime calibration is specifically pertinent to the AWR2243 chip and seemingly unrelated to subframe 0 and subframe 1

    Firstly, since you are using two-chip cascade, each of the devices are allowed to calibrate independently. It's possible that each of the devices perform calibration at different times based on the temperature of that particular device. So, I wanted to confirm if the runtime calibrations are performed or not. If runtime calibrations are performed, how are you triggering the calibrations for each device? 

    For details about calibrations, did you get a chance to look at the documents shared in the previous response?

    Can you also try to use same profile for all subframes and perform the experiment? Since there is no change in any parameters in both the profiles, you should be able to use same profile for both the subframes for this experiment.

    Samhitha Bobba said:
    Can you check the behavior across all the frames? Is the signal strength different for subframe 1 and subframe 2 across the frames? Can you perform this experiment with stationary target and provide the plot to analyze the behavior across the frames?

    Also, if possible, can you share a plot of signal strength of each subframe across all the frames?

    Is the signal strength of the target detected in Subframe 0 and Subframe 1 vary across all the frames? Did you perform the same test with other EVM?

    Regards,

    Samhitha