中文摘要：

地球静止轨道星载光通信天线在每天午夜时分存在太阳光入侵问题，为分析太阳光入侵对天线的温度场影响，建立了地球同步轨道通信卫星的激光通信终端热分析模型，对光学天线进行在轨温度仿真。计算结果表明，当太阳光倾角为±8．8°时，午夜太阳光入侵对主、次镜的温度影响高于太阳光倾角为0°的时段。光学天线太阳光规避策略可有效减小午夜太阳光入侵对其温度的影响，当机动角度为40°时，选取“零点前2．0h开始机动／零点后2．5h停止机动”的时刻组合可获得最长的连续工作时间。

英文摘要：

Geostationary orbit （GEO） satellite-borne laser communication antenna suffers from solar intrusion near midnight every day. In order to analyze the influence of midnight solar intrusion on the temperature of the optical antenna, a thermal analysis model of the laser communication terminals on the geostationary communication satellite is built, and temperature variations of the optical antenna are calculated. According to the analysis results, when the solar declination is ±8.8°, the midnight solar intrusion has more influence on the temperature of the main mirror and the secondary mirror than that of 0° solar declination. Effects of the midnight solar intrusion on the temperature of the optical antenna can be effectively reduced by using the optical antenna sunlight avoidance strategy. When the maneuver angle is 40°, by choosing a time combination of start time being 2.0 h before midnight and stop time being 2.5 h after midnight, the maximum continuous working time can be obtained.