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AWR1642: Questions for mmWave-Studio tool about "Chirp Quality" and "Phase Stability".

Jesse Wang
Intellectual 2285 points
Part Number: AWR1642
Other Parts Discussed in Thread: MMWAVE-STUDIO,

Hi,

 After installing the "MMWAVE-STUDIO - mmWave Studio GUI Tools", there is document of "mmwave_studio_user_guide.pdf". My questions are:

 1. In the CQ plot (Chirp Quality) in chapter 20.1.2.

   What is the definition of "Chirp Quality"? How can I use it.

 2. In the "Phase Stability" in chapter 20.1.3.1.

   What is the meaning of Figure 20.8? How to measure it? Should I set chirp frame with different phases?

  • 0
    TI__Expert 7215 points
    Hi Jesse,

    Chirp Quality indicates about Interference and ADC saturation. For e.g., If AWR1642 is sending chirps at 77-81Ghz. If at the same time, another mmWave Radar device transmit chirps at 77-81Ghz. Chirp quality data would indicate that part of the data between 77-81 Ghz is corrupted due to interference. Similarly if due to very close reflector, ADC gets saturated, it would be indicated by CQ data. Currently this is under development as indicated in the user guide.
    You can refer to MMWAVE ICD for more information about chirp quality
    software-dl.ti.com/.../index_FDS.html

    The figure 20.8 shows phase variation across chirps in a frame. The particular plot shows variation across chirps for same phase for the chirps. As you see there is small change ~1deg. If you configure chirps with different phase, you will the same change in the plot. For e.g. if you configure chirp 1 with 0 phase and chirp 2 with 10deg phase, you would see 10deg phase difference in the plot.

    Regards,
    Kaushal
  • 0 in reply to Kaushal Kukkar
    TI__Expert 7215 points
    Please note that Phase shifter is not supported in AWR1642.

    Regards,
    Kaushal