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AWR6843AOPEVM: AWR6843AOP EVM

Part Number: AWR6843AOPEVM

Hi,

I am using Out of the Box demo, and when I read the configuration file and from my understanding I understand  that I have three antenna transmitting at the same time

chirpCfg 0 0 0 0 0 0 0 1
chirpCfg 1 1 0 0 0 0 0 2
chirpCfg 2 2 0 0 0 0 0 4

When I record the data and parse them, I got an excel sheet as follow

My question is for frame 0, I have multiple data points are these data points considered as one chirp only? or consecutive chirps within frame 0? Even thought the three antenna are transmitting? 

Another question is, when I use mmWave Demo Visualizer, and set the Record Start to 30 seconds and choose 10 frames per second. It does not give more frames or more time? so how does the parameter affecting my data recording then?

I would appreciate your help

Regards,

Sarah

  • Hi Sarah,

    First, to clarify your understanding of the chirpCfg lines from the configuration file, you are correct that each line assigning a chirp to one of the three Tx antennas. You can tell this from the last field in the chirpCfg line, which is a bitmask for the antennas (1 = 0b001, 2 = 0b010, 4 = 0b100). 

    However, the three antennas are not transmitting simultaneously, they transmit sequentially. You can tell this from the first two fields in each of the chirpCfg lines, "chirpCfg 0 0...", "chirpCfg 1 1...", "chirpCfg 2 2...". These fields refer to the start and end index for the chirp within the larger frame. To learn more about the command fields in the configuration file, refer to the SDK Doc Section 3.4. For a more fundamental understanding of the relationship between chirp and frame, refer to the Fundamentals Whitepaper.

    Second, by the time of recording the data output from the device, the chirp concept is abstracted away from us. The frame is now the base unit. So when you have multiple data points per frame, each of those points refer to a different object the radar recognized in that frame. Thus, in frame 0-2, the radar detected 3 different objects. In frame 3, 5 objects were detected.

    Last, have you tried to increase the File Size Max parameter? That could be limiting the amount of data recorded, making it appear that increasing the FPS and/or increasing the recording time have no effect.

    Regards,

    Luke