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IWR1843BOOST: About the maximum velocity that can be extended with the extendedMaxVelocity command

Takuma Akimoto
Intellectual 640 points
Part Number: IWR1843BOOST
Other Parts Discussed in Thread: MMWAVE-SDK

Hi,

I am trying to extend the maximum velocity by enabling extendedMaxVelocity.

・I can extend the velocity by up to 3 times, is this correct?

　Looking at the e2e forum, I am confused because some posts have been answered with a maximum of 2x.

・Can the velocity be extended even faster than 3x?

・The maximum speed that can be extended is based on what parameter? Tx number? Or Velocity bin number?

　I referred to the documentation in the SDK, but unfortunately I could not understand it well.

　mmwave_sdk_03_05_00_04/packages/ti/datapath/dpc/dpu/aoaproc/docs/doxygen/html/index.html

　

Best Regards,

Takuma

  • 0
    TI__Mastermind 22517 points

    Hello Takuma,

    The most recent SDK user guide mentions that the maximum velocity is 2x vmax, however there has indeed been history of us implementing 3x. Please give me until no later than Tuesday to look into this with my team and give you a more concrete answer to your questions.

    Thank You,

    Pedrhom Nafisi

  • 0 in reply to Pedrhom Nafisi
    TI__Mastermind 22517 points

    Hello Takuma,

    Maximum velocity depends on the inter-chirp interval and hence is dependent on the chirp profile configuration(i.e. Ramp-end time, idle time, number of the TX channels N). This means that the cfg file with all the different parameters that we send prior to starting the device is very influential on maximum velocity performance. A guide on those parameters can be found in the mmWave SDK user guide. 

    In TDM-MIMO scheme we sequentially transmit through each of the N TX channels hence the inter-chirp interval from the data received from a given TX channel increases by a factor of N  à our Maximum unambiguous velocity reduces by a factor of N. 

    The max velocity extension mentioned in the mmwave-sdk documentation refers to restoring this velocity by a factor of N (number of TX channels in MIMO).

    We can improve maximum velocity performance using techniques such as the tracker to measure the range-rate of a tracked object or using consecutive chirps with different inter-chirp intervals to extend the velocity beyond the Maximum unambiguous velocity.  These techniques might give additional improvement factor of 2-3x.

    Best Regards,

    Pedrhom Nafisi