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Following our example, the above picture shows the FFT of the measurement. Y axis represents signal strenght and X axis represents the FFT sample. Note that only the 300 first samples are shown.
We can see a dominant peak centered about sample number 16.This peak should correspond to the measured dominant sinus of 4,609KHz on time domain graphic.<br>
The sampling rate used by the equipment with the default modulation is 590Ksps. This means that each sample of the FFT represents 590000/2047=288,2Hz.
If the peak is centered about sample 16 it means the frequency represented is 16*288,2Hz=4,611KHz, thus corresponding with accuracy with the calculations made on time domain.
We can see other small peaks at about samples 40 and 50. These peaks are due to other reflections on the room at a longer distance. So here an example of the possibilities of the radar to detect several targets at different distances. By But by the moment is better if we must center pay our attention on a single target scenario to keep learning about the radar signal and later we will be able to analyse more complex scenarios.