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地球同步轨道(GEO)星地激光通信终端为开敞式结构,其光通信天线裸露于卫星舱外,受交变剧烈的空间外热流影响,光通信天线符合温控要求的在轨有效工作时间每天仅有4~6h。基于现有热控技术基础,通过对太阳窗的设计削弱空间外热流的影响,改进系统热稳定性,并基于有限元分析得到使光通信天线系统热稳定性最佳的太阳窗光热特性参数优化设计,使其满足太阳透射率较高、吸收率较低,并且内、外表面红外发射率均较高的要求。采用上述太阳窗优化设计,光通信天线次镜可全天候满足温度指标,主镜全天中满足温度指标的时间可达12h,二者有效工作时间分别为基础方案(未采用太阳窗)的3倍和2倍。
Geosynchronous orbit (GEO) star ground laser communications terminal is an open structure, the optical communication antenna exposed to the satellite capsule, subject to intense alternating external heat flow space, optical communications antenna in line with temperature control requirements of the effective working hours in orbit Only 4 ~ 6h a day. Based on the existing thermal control technology, the thermal stability of the solar thermal system is improved by weakening the solar heat flow in the solar window design. Based on the finite element analysis, the thermal-solar solar thermal parameters The design is optimized to meet the requirements of high solar transmittance, low absorption, and high infrared emissivity on the inner and outer surfaces. With the above-mentioned solar window optimization design, the optical communication antenna secondary mirror can meet the temperature index around the clock, and the main mirror can meet the temperature index up to 12 hours throughout the day, and the effective working time of the primary mirror is three times of that of the basic scheme And 2 times.