研究了在卫星上太阳光扫过太阳辐射监测仪视场期间，太阳入射角的时间变化函数和在这种变角入射情况下辐射计接收腔的温度响应情况以及测量太阳辐照度的观测角变化修正问题。太阳辐射监测仪上的绝对辐射计是在腔上接收辐射功率发生微小变化的情况下，关闭快门进行电功率定标获得太阳辐射照度的，将腔接收辐射功率的这种微小变化作为角度修正因子对太阳辐照值进行了修正。风云三号卫星上两年来测得的2×104多组数据进行这种观测角变化修正后，获得的太阳常数值为1368±4 W/m2。其不确定度为0.3%，同世界气象组织推荐的公认值1367±7 W/m2及欧美国家至今在各类卫星上测量值相一致。

During the sun′s sweep of the field of view of solar radiation monitor, varying function of incident angle and temperature response of radiometer receiver cavity is studied. Calibration of time-varying incident angle for solar radiation monitor is also discussed. The absolute radiometer of solar radiation monitor detects small changes of the radiation through electrical calibration. We take radiation power of these small changes as a factor to revise solar radiation. FY-3 satellite has measured more than 2×104 sets of data in the past two years. The data is amended through the changes of observation angle and the obtained value of solar constant is 1368±4 W/m2, and the uncertainty is 0.3%. This result is in areement well with the value of 1367±7 W/m2 which is recommended by World Meteorological Organization and data measured on other satellites in the same period.