There was thing I saw someone post, they put particulates in clouds and it ablates the projectile just because it's moving so fast already.
This probably makes no sense but I wonder if you can detect the static build up in the atmosphere as it flies using the low orbit constellation satellites... I mean I thought I read it was obvious how to detect them the heat they generate as they fly.
Static thing doesn't make sense no contact, perhaps disturbing rf "surface capacitance" on the Earth lol.
Apparently they go so fast that it creates a plasma in front of them which make them basically invisible to radars https://en.wikipedia.org/wiki/Plasma_stealth
The greatest threat is tracking since hypersonic can change course rapidly