“高分四号”卫星相机热控系统设计及验证

Thermal Design and Test for Space Camera on GF-4 Satellite

"高分四号"卫星搭载的相机具有较高的分辨率和指向精度,需相机光学系统及主承力结构在全寿命周期内保持高温度稳定性,且该相机工作于地球静止轨道,所处空间热环境更为复杂,给热控设计带来极大挑战。文章结合相机在轨成像需求和空间热流特点,详细分析了相机热控设计的重点与难点,并创新性的采用了遮光罩开设散热面、间接辐射控温、南北耦合散热面等热控措施,实现了高轨相机的高精度温度控制。热平衡试验与在轨飞行温度数据表明,相机的热控设计合理可行,能够满足相机在轨成像的温度要求,为未来高轨大口径光学相机高精度、高稳定性热控设计奠定了良好的基础。

GF-4 satellite has high resolution and pointing accuracy, so highly stable thermal control for the optical system and the main load-carrying construction are required. Besides, GF-4 satellite is working in geostationary orbit （GEO） and the space environment is more complicated, which is also a big challenge for the thermal control. This paper analyzes the emphases and difficulties of the thermal control based on the thermal requirement and the space environment, and proposes an innovative thermal control methods of radiating surface on the baffle, indirect radiant thermal control and coupled radiating surface. The thermal balance test result and in-orbit temperature data indicate that the thermal design of the camera is reasonable and feasible, and the thermal control system satisfies the temperature demands. The thermal design methods also lay a good foundation for the subsequent large aperture optical remote sensor and highly stable thermal design technology.