Using radars with only distance and relative speeds data, no direction at all, to identify equipment has a long history in the military. https://en.wikipedia.o

Using radars with only distance and relative speeds data, no direction at all, to identify equipment has a long history in the military. https://en.wikipedia.org/wiki/Radar_MASINT#Non-Cooperative_Target_Recognition https://en.wikipedia.org/wiki/Radar_MASINT#Non-Cooperative_T... Humans come in greater variety than airplanes but recognition, especially with things like gait analysis, should be quite possible. Now, I'm skeptical that a photo of a person contains enough information to allow for mmWave recognition though, but I'd assume video does.