6 August 2009 A sun tracking and back-sunlight target detecting system
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A back-sunlight target is a target which comes out in the direction of the sun or which flies across the sun. When the sun enters the field of view (FOV) of a conventional detecting system, the sun's intense radiation will saturate the focal plane detector or may even damage it, so there exists solar-blind regions that conventional systems can not observe. Therefore to track the sun and to detect back-sunlight targets is very important in military defense because the potential of back-sunlight military targets, such as battle plane or missiles "coming out of the sun", cannot be avoided. A resolution for sun tracking and back-sunlight target detecting is proposed here and its experimental system is designed and tested. This system can be a useful supplement for conventional detecting systems. The system consists of a sun capturer, a back-sunlight target detector, a two-dimension tracker, and a data acquisition module. In order to detect and identify back-sunlight targets, the back-sunlight target detector has to stare at the sun. This process comes in two steps. First the sun capturer searches and coarsely tracks the sun and then the back-sunlight target detector finely tracks the sun and images it, while two dimensional motor gimbals are used as mechanical tracker of the system. When any back-sunlight target is found, the data acquisition module will provide the external processors with the information of the sun and the back-sunlight target for further processing. The system's tracking accuracy of the sun is 0.006°, and the detecting resolution of back-sunlight targets is 0.0004°.
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Fan-sheng Chen, Fan-sheng Chen, Sheng-li Sun, Sheng-li Sun, } "A sun tracking and back-sunlight target detecting system", Proc. SPIE 7384, International Symposium on Photoelectronic Detection and Imaging 2009: Advances in Imaging Detectors and Applications, 73841T (6 August 2009); doi: 10.1117/12.835685; https://doi.org/10.1117/12.835685

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