“高分四号”卫星相机在轨温度分析及热设计优化

随着空间相机分辨率日益提升，对光机主体等核心部组件的温度稳定性和均匀性要求也越来越高，地球静止轨道（GEO）空间外热流复杂且恶劣，实现相机高精度热设计挑战极大。针对"高分四号"卫星相机热设计的难点和特点，基于结构热控一体化的设计理念，采取了入光口热流屏蔽、间接辐射控温、散热面耦合等热控技术，实现了相机高精度控温；分析了相机入轨4年的温度数据及符合情况，验证了相机热设计的正确性，并根据在轨运行情况提出了热设计优化建议，为进一步提升地球静止轨道相机控温精度、降低热控资源提供支撑。 

On-orbit temperature analysis and thermal design optimization for camera on GF-4 satellite

With the increase of space camera resolution, the requirements for temperature stability and uniformity of the optical system and the main load-carrying construction become higher and higher. It is a big challenge for the high-precision thermal control design of the Geostationary Orbit (GEO) camera due to the complicated space environment. According to the difficulties and characteristics of the GF-4 satellite camera's thermal control design, based on the design concept of integration thermal control design, thermal control technologies such as heat flow shield at the optical entrance, indirect radiation thermal control and coupled heat radiating surfaces are adopted to achieve high-precision temperature control; the temperature data of the camera in orbit for four years and the corresponding conditions are analyzed, the correctness of the camera's thermal control design is verified, and optimization suggestions are proposed based on the operation conditions in orbit. The thermal design methods also provide support for further improving the temperature control accuracy and reducing the thermal control resources of the geostationary orbit cameras.