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I'm dealing with transformation of coordinates after I do the 3d FFT doa estimation.

Data below is a car in front of the radar board, and the angle of arrival is "0", 50m.

Left image is the row has the maximum value (50m) of right one.

How can I transform the x-axis which means sampling index to the DOA(degree) like right image?

enter image description here

According to the ti document: https://training.ti.com/sites/default/files/docs/mmwaveSensing-FMCW-offlineviewing_0.pdf

My parameters are:

lambda = c/fc, d = lambda/2

So the transformation should be: doa = arcsin(index/pi).

But it seems like the results are wrong.

enter image description here

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