For space target photoelectric detection, the false-alarm problem is analyzed using the radiation theory. Firstly, the mathematic equations are deduced about the radiation of space target and its background; Secondly, the numerical calculation is carried out by taking U.S. KH-12 as research object, and the false-alarm problem is analyzed. The results show that: the main false-alarm sources are sun, earth-atmosphere system, moon and Venus. This work can provide theoretical reference for the design of space-based all-weather imaging system.
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