某低轨倾斜轨道相机热控系统设计与验证

某新型对地观测空间相机已随新技术试验星成功发射入轨。相机运行于低轨倾斜圆轨道为非太阳同步轨道，其面临的空间外热流变化非常复杂。为了保证相机在轨稳定工作，光学系统和承力结构需要具有较高的温度稳定性，低温红外探测器需要配备大功率制冷机。复杂的外热流环境和高稳定度的指标要求给热控系统的设计研制带来了极大的挑战。根据任务特点和需求，对热控研制任务展开了分析，提出了借助卫星平台姿态规避，间接辐射控温以及±X侧耦合散热面等热控措施。热平衡试验与在轨飞行实测数据表明，相机光学系统的温度水平保持在（18±2） ℃范围内，稳定度优于±0.3 ℃/轨，满足相机各项温度指标，证明相机热控设计方案合理可行，相机在轨工作条件良好。

Thermal design and test for space camera on inclined-LEO orbit

A novel earth observation space infrared camera has been successfully launched into orbit by a test satellite. The inclined-LEO orbit for the camera is not a sun-synchronous orbit, and thus the variation of external heat flux for the space load is extremely complicated. In order to guarantee the camera operating stably in orbit, high temperature stability for the optical system and the load-carrying construction and large power pulse tube cryocooler of low temperature infrared detector are both required. The complicated orbit heat flow and high stability thermal control indexes brought a big challenge for the thermal design. Based on the thermal control index and the space environment, the characteristic of the thermal design was analyzed and the team proposed a set of measures to meet the targets, like attitude maneuver, indirect radiant thermal control and coupled radiating surface. The thermal balance test result and in-orbit temperature data both indicated the thermal stability of the optical system was better than ±0.3 ℃ for each orbit within the temperature level of （18±2） ℃. Results shows that the thermal design is reasonable and practicable, and the space infrared camera works in good condition in orbit.