I have this data set which is recorded from 50 children with FMCW radar to detect their heart rate and respiration rate. I am using this data set and I want to just calculate the range FFT and after that applying Doppler FFT in one of the receivers of it. The size of raw data is 4 ** 512 ** 6,000, where 4 is the number of receivers, 512 is the number of samples of each frame and 6,000 (60 * 5 minutes * 20 frames per second) is the number of all the frames.