I'm working on the processing of raw FMCW radar data.
In my case the radar works in the [6.014-7.76] GHz band (I have 187 frequency points starting from 6.014 GHz and ended with 7.76GHz) and the data that I collect are organized in a complex-double numbers (I&Q) matrix [Number of frame x 187] per each couple tx-rx antennas.
Unfortunately the radar company doesn't want to provide me with so much information about how the radar works and I am not much of an expert. They said that the collected data are the channel response in the frequency domain.
Now if I plot one received frame I get the results shown in the figure 1 and if I do 1D fft on the detrended raw data I get the figure 2 ( RTI (range time intensity) plot where you can see two humans moving forth and back in front of the radar).
I'm a little bit confused: I thought that the fft processing were to do on the dechirped time domain data to get the RTI plot but I'm doing it on frequency domain and I'm getting result that makes sense, what am I missing here?