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地球同步卫星(GEO)激光通信系统的光学天线暴露在卫星外部,太阳辐射会对光学天线产生严重的影响,造成可通率下降,尤其阳光直接照射天线主镜时系统必须采取规避措施,影响更加严重。采用遮光罩可以改善太阳热效应对光学天线的影响,但受尺寸等限制,其效果有限。根据GEO对地激光通信系统的结构和环境特点,分析太阳对光学天线主镜的辐照情况,设计一种在传统圆筒遮光罩内部增加栅板的改进型遮光罩,减小太阳光的直射角度范围。结合热控设计,对系统在太阳辐照环境下天线光学元件的温度变化情况及可通率进行仿真分析。分析表明采用改进型遮光罩后,系统的可通率由采用传统遮光罩时的93%提高到99.5%,基本达到全天时工作,极大地减小了系统的不可通时间,提高了链路的可用性。
The optical antenna of GEO laser communication system is exposed to the outside of the satellite. The solar radiation will have a serious impact on the optical antenna, resulting in a decrease in the pass-through rate. In particular, the system must take measures to circumvent the direct sunlight on the primary mirror and affect more serious. Hood can improve the solar thermal effect on the optical antenna, but limited by the size, the effect is limited. According to the structural and environmental features of the GEO laser communication system, this paper analyzes the sun’s radiation to the primary mirror of the optical antenna, designs an improved light shield with a grid plate inside the traditional cylinder hood to reduce the direct sunlight Angle range. Combined with the thermal control design, the temperature variation and the pass-through rate of the antenna optical element in the solar radiation environment are simulated and analyzed. The analysis shows that with the improved hood, the system’s pass-through rate increases from 93% to 99.5% with the traditional hood, and basically works all day, greatly reducing the system’s un-pass time and improving the link Availability.