【摘要】 太阳辐射监测仪在轨飞行中,在太阳扫过宽视场绝对辐射计视场期间动态测量太阳辐照度,测量过程中进入辐射计接收腔的杂散光对测量精度有一定的影响。本文通过模型软件分析、风云辐射计外场标定测量和神舟三号辐射计在轨数据修正3个方面对宽视场辐射计的杂散光分布随角度变化的情况进行了分析。结果显示:随光线入射角的增大,杂散光影响基本呈线性增大。太阳辐射监测仪的宽视场绝对辐射计无遮拦视场角为-9.2°~+9.2°,±7°内视场角的模拟分析和地面标定测得结果基本一致,最大值达到0.79%。神舟三号飞船上的辐射计无遮拦视场角为-5.2°~+5.2°,视场角较小,消光光栏多,杂散光的影响相对较小。用模拟分析结果对星上获得数据进行了修正,结果表明,杂光修正降低了系统误差。更多还原

【Abstract】 For a solar radiation monitoring system in orbit,the solar irradiance is measured dynamically while the sun scans over the Field-of-view(FOV) of a Wide Field-of-view(WFOV) absolute radiometer,in which the stray light entered a receiving cone will effect on the measurement precision.In this paper,the stray light distribution with the incident angle changes of the sun light is analyzed with respect to three aspects: the model analysis,outfield measurement of FY-3 and the correction for orbit data of SZ-3.Analytical results show that the stray light increases with the incident angle in a linear way.The slope angles of FY-3 are about-9.2°～+9.2°.The simulation result is consistent with that of the measurement within-7°～+7°,and the max value reaches by 0.79%.The slope angles of SZ-3 are about-5.2°～+5.2°,which is smaller than that of FY-3.For using more baffles,the effect of stray light is very little.The stray light correction for the orbit data of SZ-3 by the analyzed result obviously reduces the system error.更多还原