为了让空间相机在适合的温度条件下工作，提出一种基于温度水平的主动热控系统。首先，分析相机达到温度平衡的条件，确定主动热控策略；其次，介绍热控系统的构成及工作原理；然后，将相机图像质量无本质影响作为条件，确定主动热控策略中的各项控温指标；最后，确定温度控制算法。相机在轨工作的实验结果表明：依据主动热控策略，系统能够控制相机温度达到平衡，主镜组件与基准温度的温差不大于1 ℃，主镜组件的周向温差不大于1 ℃，主镜与次镜组件的温差不大于2 ℃，主镜与三镜组件的温差不大于5 ℃，温度控制结果满足主动热控策略中的各项控温指标要求，满足相机工作时对温度的要求。

In order to make the space camera to work under the condition of appropriate temperature, the active thermal control system based on temperature level was proposed. Firstly, the condition of temperature balance was analyzed and the active thermal control strategy was ascertained. Secondly, the system composition and work principle were introduced. Thirdly, the temperature control indexes of active thermal control were determined under the condition of no essential influence to image quality. Finally, the algorithm of temperature control was determined. Experimental results indicate that the active thermal control system can make the camera in temperature balance based on the active thermal control strategy, the difference in temperature between primary mirror and reference temperature is no more than 1 ℃, the circumferential difference in temperature of primary mirror is no more than 1 ℃, the difference in temperature between primary mirror and secondary mirror is no more than 2 ℃ and the difference in temperature between primary mirror and third mirror is no more than 5 ℃, the results of temperature control are satisfied the requirements of control indexes of the active thermal control strategy and the camera work temperature.