Tool/software: TI-RTOS
I am confused about the plot of the 1D range FFT from the mmWave SDK 1.2 demo visualizer. I have configured my device for a 40MHz/us slope, 6000 Msps sampling rate, complex 1x. Here is the output of the visualizer:
As you can see, the maximum range is 22.41211m, which using the equation f=(2*d*S)/c where S is the frequency slope and c is the speed of light, that frequency is just shy of 6MHz. The range resolution here is 0.08789m which using the equation again yields 23.43kHz/sample frequency resolution.
Therefore, my question is: why can you consider any frequencies above 3MHz? According to Nyquist, you can't accurately sample at a frequency more than half of your sampling frequency, which in this case is 3MHz. That would correspond with 11.25m and above being cut off, which means I have less detections than the graph makes it out to seem.
Does the ADC sampling frequency already consider the Nyquist rate or is the 1D FFT plot above simply showing too much information?
