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DCA1000EVM: I want to create a 2d fft image through the captured raw data.

Yeon Woo Lee
Prodigy 20 points
Part Number: DCA1000EVM
Other Parts Discussed in Thread: IWR6843ISK-ODS

Hi TI Customer Support, 

I am a beginner student studying radar. So please escuse me if the question is a bit stupid.

I am using IWR6843ISK-ODS with DCA1000EVM capture board. I have a question.

First, I was able to check the corresponding result through the mmwave studio.

For machine learning, I intend to produce the above "2d fft image" through MATLAB. 

This is to be solved by accessing raw data by referring to the document swra581b (9.2).

Therefore, I modified the MATLAB Example as follows.

-------------------------------------------------------------------------------

% return receiver data
retVal = adcData(1:4, 1:32768);
fft_out = fft2(retVal);
fft_out = abs(fftshift(fft_out));
fft_out = 20*log10(fft_out);

-------------------------------------------------------------------------------

ADC Bits 16, complex1x, ADC sample 256, No of chirp Loops: 128, No of frame 8

I followed the above specifications, so 32768(ADC sample(256) x No. of chirp(128)) data in one frame.

But I can't see the same image in MATLAB as I saw in mmwave studio.

What is wrong?