FY-3/中分辨率光谱成像仪星上黑体的在轨太阳污染模拟与抑制

对风云三号(FY-3)中分辨率光谱成像仪(MERSI)的黑体进行了在轨太阳污染模拟,以掌握在轨太阳污染对面源黑体的影响,同时研究了抑制太阳污染的措施。模拟了FY-3卫星轨道及全轨道周期内太阳光的入射角,使用Tracepro软件建立了太阳污染模拟的模型,利用太阳光入射与MERSI的相对位置对太阳污染进行仿真,分析了污染随光谱成像仪扫描镜旋转和卫星飞行位置的变化。最后,根据分析结果设计了太阳污染抑制措施,并对抑制效果进行了仿真验证。结果表明:在扫描镜附近区域设置遮光板,有效地抑制了太阳光的污染,使辐射量级小于0.1 W,整个太阳污染功率下降了97%以上,对黑体有良好的保护效果。另外,提出的方法提高了面源黑体温度的均匀性和稳定性,保证了红外通道星上定标精度。

Simulation and suppression of solar on-orbit pollution of FY-3/MERSI onboard blackbody

The solar on-orbit pollution of a blackbody on the FY-3/MERSI(FY_3 Medium Resolution Spectral Imager) was simulated to explore the effect of the solar on-orbit pollution on the surface source blackbody, meanwhile, the method to suppress the solar pollution was researched. The orbit of FY-3 satellite was simulated and the solar incidence angle at each point on the orbit was recorded. Then, Tracepro software was used to establish solar pollution simulation model and the relative position of the sun and the imager was used to simulate the solar pollution and analyze the pollution changes when the imager' scan mirror scanned and the satellite flied. At last, suppression methods for the solar pollution was designed based on analyzed results, and the suppression effects were verified by simulation experiments. The results show that the solar pollution of the surface source blackbody has be removed by designing a light board near the scanning mirror, by which the power of pollution radiation is less than 0.1 W, reduced by over 97%, and protects the surface source blackbody effectively. Moreover, the uniformity and stability of the surface source blackbody are improved and the calibration precision of infrared channel onboard is guaranteed.