(CNN) What is a suspected Chinese spy balloon doing above the US?
Refer to CNN Exclusive: FBI investigation determined Chinese-made Huawei equipment could disrupt US nuclear arsenal communications. A possible explanation:
- Inside the skin of the balloon, there is an electronically steerable antenna array.
- A goal is to intercept and precisely determine locations of 44 gHz uplinks (from ground station to satellite) of the Milstar system.
- This knowledge could be used to disable one of the redundant command paths for the nuclear deterrent.
- The uplink beams are very narrow, not practical targets for typical satellites.
The National Reconnaissance Office has space-based ability to do this; the sigint satellites cost $1BN apiece. This is currently beyond the capabilities of China.