Given the speculation about the resolution of GF-13, I reup this article about high-altitude surveillance satellites :https://satelliteobservation.net/2016/10/17/persistent-surveillance/ …
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I wonder if you have anything on beyond-LEO *radar* satellite designs, as there are rumors that the Chinese are launching something like it within the next few months. Maybe even in GEO where I understand Synthetic-Aperture Radar doesn't work due to its operating principle.
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There are DLR papers on a SAR satellite in geosynchronous (but not stationary) orbit. It makes a pattern shaped like an 8 in the sky, and uses that movement for image formation.
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Das Laden scheint etwas zu dauern.
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