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Discgear
Att inte IRST skulle fungera i moln är ju rent nonsens. Däremot påverkar moln liksom höjd och temperaturer..
Nej IRST ser inte genom tjockare moln. Men det kan se genom haze och dust.
Current methods have too many drawbacks. Infrared cameras, of the sort used by military planes to track moving targets, can’t see through clouds. Synthetic aperture radar does the trick but it has a slow frame rate. SAR combines radar images to produce the effect of having a really long antenna, but it’s much better for still shots of a static target than continuous streaming video. Moving to higher frequency can increase the frame rate but that also makes the radar weaker against atmospheric conditions like clouds and smoke. Other, more experimental approaches to the cloud-and-smoke problem include the Army’s classified “Brown-Out Leap Ahead.”
DARPA’s Thursday announcement represents the most public disclosure of how far ahead the military is in seeing through atmospherics. In recent tests, researchers were able to take “uninterrupted live video of targets on the ground even when flying through or above clouds,” DARPA program manager Bruce Wallace wrote.“The [electro-optical / infrared] sensors on board the test aircraft went blank whenever clouds obscured the view, but the synthetic aperture radar tracked ground objects continuously throughout the flight.”