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DCA1000EVM: How to set the parameters of chirps and frame when collecting ADC data with three TXs of DCA1000EVM and IWR1443

user5972929
Intellectual 280 points
Part Number: DCA1000EVM
Other Parts Discussed in Thread: IWR1443

  I want to use three TX of dca1000evm and iwr1443 to collect ADC data to estimate the direction angle and elevation angle of the object.When I use two TXs, my configuration is shown in the figure below.

  So how can I set the parameters of frame and chirps of three TXs to collect data?

  • 0
    TI__Mastermind 40355 points

    Hi, 

    Since you already have two chirps using TX0 and TX1, you need to define another chirp, and uses TX1. 

    Then in the frameCfg, you will need to program start chirp to 0 and program end chirp to 2 to create a 3 TX TDM-MIMO configuration.

    Best,

    Zigang 

  • 0 in reply to zigang Yang
    Intellectual 280 points

           Dear Yang Zigang, thank you very much for your answer, but I still have a question.

          When I use two transmit antennas, in the frameCfg, the No of Chirp Loops is set to 64, and the two transmit antennas transmit chirps alternately, so there are 2 * 64 = 128 chirps in a frame. But 128 can't be divided by 3. How to set the No of Chirp Loops?

          Can I set the no of chirp loops to 50, so there are 150 frames in a frame? (according to the file swra553, the more chirps a frame contains, the higher the speed resolution.)

  • 0 in reply to user5972929
    TI__Mastermind 40355 points

    HI,  you can try to set the number of loop to 32 to start with.  Or you can still set the number of loop to 64, but change the idle time from 100ns to 7ns. Idle time is in the profileCfg window in your first figure.   Usually idle time just need to be around than 7ns.

    Best,

    Zigang

  • 0 in reply to zigang Yang
    Intellectual 280 points

    Dear Yang Zigang:

    Your answers solved my problem perfectly. Thank you very much.