Justinian
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Check this out.. What I find interesting is the lower portion of the page where it mentions that the KH-11 satellite has a resolution of 3-5 feet. This is pretty amazing. Might want to start wearing those foil helmets now.
The Spy Satellite So Stealthy that the Senate Couldn't Kill It
"Although the resulting imagery was not in the same class as that of the KH-11, with a resolution of three to five feet, ONYX did have two major advantages. The KH-11 could not produce imagery in the presence of significant cloud cover, which prevented light or heat from reaching the spacecraft sensors, but ONYX could. And whereas the KH-11's visible light sensors were of little value during darkness, radar imagery systems worked well at night."
See also how ONYX can "see" through cloud cover using its radar sensing capabilities.
The Spy Satellite So Stealthy that the Senate Couldn't Kill It
"Although the resulting imagery was not in the same class as that of the KH-11, with a resolution of three to five feet, ONYX did have two major advantages. The KH-11 could not produce imagery in the presence of significant cloud cover, which prevented light or heat from reaching the spacecraft sensors, but ONYX could. And whereas the KH-11's visible light sensors were of little value during darkness, radar imagery systems worked well at night."
See also how ONYX can "see" through cloud cover using its radar sensing capabilities.