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AWR2243: AWR2243 cascade calibration

bo yang99
Prodigy 120 points
Part Number: AWR2243

Hi：

I use your company's AWR2243 cascade product. I have a few questions about calibration.

1、Document   "mmwave_studio_cascade_user_guide" and  "AWRx_TX_Channel_Calibration_Script_User_Guide"  give the RF board directional dimension antenna calibration method and process when using MIMO and BF modes，but no detailed principles are given.  If I modify the antenna layout (transmitting antenna spacing, etc.), do this set of procedures and corresponding processing procedures need to be modified? Does this process still apply? If it needs to be modified, where and how to modify it? Are there relevant reference documents?

2、On the basis of question 1, the document gives the calibration of the direction dimension, how should the calibration of the pitch dimension be handled?

3、In the document “self-calibration”, a series of RF-related part calibrations are described, and the TX phase calibration is mentioned in the document. The TX phase calibration of BF mode is also explained in document  "AWRx_TX_Channel_Calibration_Script_User_Guide". Does the TX phase calibration of these two documents refer to the same calibration problem?

4、In the self-calibration document, the customer’s factory is mentioned for some calibrations such as temperature calibration. What does this part mean? Do I need to calibrate myself for temperature calibration? What is the calibration method and environment?   

  • 0
    TI__Guru*** 149124 points

    Hi,

    It is helpful for reference  to provide the location of the documents you have mentioned in your thread

    1) AWRx_TX_Channel_Calibration_Script_User_Guide

    C:\ti\mmwave_studio_03_00_00_14\mmWaveStudio\MatlabExamples\AWRx_TX_Channel_Calibration_Script_User_Guide.pdf

    2) Self Calibration in TI's mmWave Radar Devices

    https://www.ti.com/lit/an/spracf4a/spracf4a.pdf

    The first document addresses the need for phase calibration in a cascaded system. The examples provided are specific to the TI Cascade system. If you would need to understand and modify the scripts for your specific antenna. Unfortunately we don't have additional documentation regarding porting the scripts to a new antenna.

    The second document addresses the self calibration features integrated in the sensor. These calibrations can be enabled or disabled. When enabled they run without user interraction. The purpose of the self calibrations is to compensate for temperature drift effects.

    Thank you

    Cesar

  • 0 in reply to Cesar
    Prodigy 120 points

    Hi 

    First of all, thanks for your reply.

    There are still 3 questions to ask：

    first： AWRx_TX_Channel_Calibration_Script_User_Guide and Self Calibration in TI's mmWave Radar Devices.

    Is the “3.11 TX Phase Shifter Calibration”  in the document “Self Calibration in TI's mmWave Radar Devices ”   the same as the phase calibration method in the document AWRx_TX_Channel_Calibration_Script_User_Guide?

    second：

    Does the temperature calibration mentioned in the document   "Cascade Coherency and Phase Shifter Calibration Application Note" require no user interaction? Does the user only need to enable temperature calibration?

    third： What is the relationship between TX phase offset calibration and current temperature? Will the TX phase offset error automatically change as the channel temperature changes?

    （1）Does TX phase shifter offset compensation require information about the current board temperature?

    （2）Is it necessary to keep the temperature monitoring enabled during the application process of the development board?

    （3）Whether the TX phase offset value will be automatically corrected as the temperature changes (if the temperature monitoring is turned on)

  • 0 in reply to bo yang99
    TI__Guru*** 149124 points

    Hi,

    Please give me some more time to review your request

    thank you

    Cesar

  • 0 in reply to Cesar
    TI__Guru*** 149124 points

    Hi,

    bo yang99 said:

    irst： AWRx_TX_Channel_Calibration_Script_User_Guide and Self Calibration in TI's mmWave Radar Devices.

    Is the “3.11 TX Phase Shifter Calibration”  in the document “Self Calibration in TI's mmWave Radar Devices ”   the same as the phase calibration method in the document AWRx_TX_Channel_Calibration_Script_User_Guide?

    As the document Self Calibration in TI's mmWave Radar Devices mentions TX Phase Shifter Calibration is performed (if enabled) automatically only at boot time. This boot time calibration is not the same as the one described in the document AWRx_TX_Channel_Calibration_Script_User_Guide.

    bo yang99 said:

    second：

    Does the temperature calibration mentioned in the document   "Cascade Coherency and Phase Shifter Calibration Application Note" require no user interaction? Does the user only need to enable temperature calibration?

    All the calibrations described in the document "Cascade Coherency and Phase Shifter Calibration Application Note"  are not automatic. They require user interaction

    bo yang99 said:
    third： What is the relationship between TX phase offset calibration and current temperature? Will the TX phase offset error automatically change as the channel temperature changes?

    Yes, as mentioned in the document "Cascade Coherency and Phase Shifter Calibration Application Note" , the Phase offset will vary according to operating temperature and operating frequency. This is the reason why calibration is needed.