低地球轨道6u立方体卫星成像有效载荷的设计和环境试验:KITSUNE任务

M. H. Azami, Necmi Cihan Orger, V. H. Schulz, Takashi Oshiro, J. R. Alarcón, A. Maskey, Kazuhiro Nakayama, Yoshiya Fukuda, Kaname Kojima, T. Yamauchi, H. Masui, M. Cho
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引用次数: 1

摘要

由于对地观测任务的苛刻要求和空间环境的影响,小卫星平台对地观测任务仍然是一项具有挑战性的任务。在这项研究中,提出了相机有效载荷的发展和任务要求,以及在近地轨道运行的6U立方体卫星KITSUNE的地面测试结果。由于立方体卫星的低热容量和快速温度变化阻碍了相机聚焦,因此有效载荷开发的主要挑战是在轨道热真空环境下保持光学系统的聚焦。首先,载荷是根据5米级成像任务的物镜开发的,该任务具有31.4 MP CMOS传感器和300毫米焦距的镜头。其次,聚酰亚胺加热器和多层绝缘体用于成像操作期间保持焦点。第三,准直透镜用于热真空测试期间的图像捕获。使用各种焦点测量算子对这些图像进行了深入的分析。由于试验结果的一致性,发现对角拉普拉斯算子是最合适的算子。结果还表明,相机传感器产生的热量对镜头温度有显著影响,最终确定镜头的目标温度为- 1.8°C。最后对测试结果进行了讨论,包括热真空、振动、总电离剂量以及阳光直射对CMOS传感器的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Design and environmental testing of imaging payload for a 6 U CubeSat at low Earth orbit: KITSUNE mission
Earth observation (EO) missions remain a challenging task for small satellite platforms due to their demanding requirements and space environment effects. In this study, the camera payload development and mission requirements are presented together with the ground-based testing results for a 6U CubeSat called KITSUNE, operating at low Earth orbit. The major challenge of the payload development is maintaining the focus of the optical system despite the thermal vacuum environment in orbit since the low thermal capacity and rapid temperature variation of CubeSats hinder the camera focus. First, the payload is developed with an objective of a 5-m-class imaging mission, which has a 31.4 MP CMOS sensor and a lens with a 300-mm focal length. Second, polyimide heaters and multilayer insulators are utilized in order to maintain focus during imaging operations. Third, a collimator lens is used to aid in image capture during thermal vacuum tests. These images are analyzed thoroughly using various focus measure operators. The Diagonal Laplacian was found to be the most suitable operator due to the consistency in test results. The results also showed that the heat generated by the camera sensor significantly affects the lens temperature and, ultimately, the target temperature of the lens was defined at −1.8°C. Finally, the test results are discussed, including thermal vacuum, vibration, total ionization dose, and the effect of exposure to direct sunlight on the CMOS sensor.
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