Here's a hackaday project[1]. Riffing on that project, you could use a NanoVNA[2] (I have a clone) as a ready built Time Domain Reflectometer, which you can co

Here's a hackaday project[1]. Riffing on that project, you could use a NanoVNA[2] (I have a clone) as a ready built Time Domain Reflectometer, which you can connect to via USB. That gets you a radar scan in one dimension radar, which you'd then have to move in a grid, and collect a set of data. You then have to work backwards and compute a 3d tomograph.[3] [1] https://hackaday.com/2020/10/22/affordable-ground-penetrating-radar/ https://hackaday.com/2020/10/22/affordable-ground-penetratin... [2] https://nanorfe.com/nanovna-v2.html https://nanorfe.com/nanovna-v2.html [3] https://en.wikipedia.org/wiki/Tomography https://en.wikipedia.org/wiki/Tomography