Precisely. You need synthetic aperture (or similarly complicated Fourier analysis) with multiple transceive pathways to get a good 3D model of the environment.

Precisely. You need synthetic aperture (or similarly complicated Fourier analysis) with multiple transceive pathways to get a good 3D model of the environment. It's very impressive that this project managed to miniaturize both the radio hardware and the computational hardware required for this. You need to perform FFTs very fast to make this work.