How can redundancy in spacecraft bus contribute to SEW resilience?

• A. Increases likelihood of a single point of failure.
• B. Allows continued operation if a sub-system is compromised or degraded by SEW, maintaining critical functions with degraded performance.
• C. Reduces total power available.
• D. Is irrelevant to SEW.

Answer: (B)

Redundancy in a spacecraft bus builds resilience by providing multiple backups and alternate pathways for critical functions. In the face of space electromagnetic warfare, components or links can be jammed, spoofed, or degraded. With redundant subsystems, different processors, communication channels, sensors, or power routes can take over or collaborate, allowing essential operations to continue even if one element is compromised. The mission can keep performing its most important tasks, though可能 with reduced performance or capabilities, rather than failing completely.

This is why the best choice describes continued operation of critical functions with degraded performance when a sub-system is affected by SEW. The other points miss the purpose: redundancy lowers the risk of a single point of failure, not increases it; it doesn’t inherently reduce total power—if anything, it adds some overhead but yields greater survivability; and it is directly relevant to SEW resilience, not irrelevant.