Nobody outside the USA and DS have DEW satellites.
We have had them for over 30 years.
Several uses have caused other to notice, and now they are public record.
You can find more info on defense contractor's websites, etc.
The "plane mounted" version is public, but it is well known the satellites exist.

Also, did anyone notice in the Q CORONA posts that the numeration forms a sequence of 2^(n+1) (so starts with 2 and doubles). One is missing in this series?
Do we have any mathfags / programmerfags here?