雷达定标卫星光学散射特性研究

Research on optical scattering of radar calibration satellite

对主体为铝球用于雷达定标的一批卫星进行了地基光学观测,验证了其光度变化和光谱特性简单,易于开展光度和光谱特性影响因素分析。实验室对铝球的仿真测量也证明了铝球具有各向同性好、反射特性和光谱特性平稳等特点。研究团队基于测量结果构建了铝制球体卫星的光度计算模型,与实测结果的对比分析表明,利用铝制球体的材料特性和外形特征可最大程度的简化卫星光度计算模型,也证明了实测方法和光度计算模型构造方法的正确性,使得卫星光度可实时保精计算,可应用于天基和地基光电探测设备的动态能量定标和高速、变速运动状态下的探测能力标定。

We conducted ground-based optical observations on a group of satellites used for radar calibration,whose main parts were aluminum balls.Our observations verified their luminosity changes and spectral characteristics were simple,and it was easy to carry out analyses on the factors which affected luminosity and spectral characteristics.The simulation measurement in the laboratory for the aluminum ball also shows its characteristics of good isotropicity,stable reflective and spectral characteristics.Based on the measurement results,we constructed the luminosity calculation model for the aluminum-ball satellite.Comparing with the measured results,we found that the characteristics of the material and shape characteristics of the aluminum ball can simplify the satellite photometric calculation model to the greatest extent.Moreover,the methods of the measurement and the luminosity calculation model construction were also proved to be correct,enabling the real-time satellite luminosity calculation,which can be applied to the dynamic flux calibration and the calibration of the detection capability under fast and variable-speed motion of space-based and ground-based optical detection equipment.