Coding for MATLAB:

I built a radar using coffee can and PCBs, and used it to measure a metal plate ~21 meters away.

Using a .wav file and through MATLAB, I obtained the graph:

Is there a way to write a code to automatically tell where the distance of the radar is? I can tell from the graph, but I need a more precise application. Datacursormode does not count. The code has to automatically read where the distance of the object is due to the intensity.

RTI without clutter rejection 20 30 40 60 70 -80 100 120 140 80 20 40 range (m)