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Original question:

AWRL6432BOOST: Question about antenna radiation patterns (LBK Gain ?)

IWRL6432BOOST: about LBK Gain formula

Dakeun Yun
Prodigy 60 points
Part Number: IWRL6432BOOST
Other Parts Discussed in Thread: IWRL6432

Tool/software:

I'm also trying to measure LBK gain with IWRL6432 module.

ADC data is caputred by SPI communication.

Could you explain more specifically about how to calculate LBK gain from ADC Raw data?

I understand as like this

For 1 vitual ant and 1 chirp

Capture ADC Raw data(code) --> change to dB Scale :10 * log10(ADC Raw data) --> find max among db Scale data(if num of adc samples is 128, find max among 128 data)

Is this right? If I calculate like this, the value looks too small.

Secondary, how many chirps do you use for mesasuring one point and how do you summurize data?

Do you average each peak data of all chirps?

  • 0
    TI__Genius 9180 points

    Hi

    Thanks for your query. Please allow us a couple of days to respond.

    Regards

  • 0
    TI__Mastermind 36725 points

    HI, there:

    Your understanding is not correct.  Here is what we do:

    1) Apply range FFT using ADC samples

    2) Apply Doppler FFT cross chirps

    3) Find the peak in zero Doppler bin (assume your testing target is static)

    4) Record the amplitude (abs) of this DopplerOut(rangePeakIndex, zeroDopplerBin) for all the antenna pair.

    5) Rotate the sensor to different angle, and record the above peak amplitude cross all the rotation angles

    6) Plot this amplitude cross all rotation angle, which is the radiation pattern.  You can plot this amplitude in 20*log10() to plot in dB.   

    Best,

    Zigang