太阳同步卫星是一种常见的卫星，对它进行实时的温度预测具有极重要的作用。文章在分析了卫星轨道外热流和平均温度的周期分布后，对其温度进行了实时预测。由于采用相邻的两圈预测下一圈的温度分布，因此可以作为卫星热故障诊断的依据，避免了误差的积累。通过飞行试验，证明该方法具有很强的可信度。

Temperature prediction on-line for sun synchronous satellite is very essential. In this paper, satellite's temperature is predicted on-line after the analysis to the cycles of orbital external thermal current and average temperature. Temperature distribution predicted by last two circles can be the basis on thermal fault diagnosis for satellites. Meanwhile the error accumulation can be avoided. Fly experiment data show that the method is reliable.