On 1/31/20, jim bell <jdb10...@yahoo.com> wrote: > Check out the Walabot. > https://the-gadgeteer.com/2016/11/15/walabot-diy-review/ > I don't know how they do this, Is it some sort of mini-phased-array radar?
Maybe more like... https://en.wikipedia.org/wiki/Ground-penetrating_radar
