BGT24ltr11 radar range measurement method inquiry

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I recently plan to use bgt24ltr11 to measure distance. After I have collected the medium frequency signal, how should I process it to obtain distance information for a stationary target? My transmission method is pulse linear frequency modulation, that is, the VCO is modulated with a sawtooth wave, and it is sent every once in a while. At first, I used the FFT method for echoes to check the spectrum to find the peak value to determine the distance, but in the official demo board, this method is used to measure moving targets, and there is no mention of measuring static targets.

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