卫星光通信系统中结构件的表面散射会直接影响信号的传输效率。因此，基于自行搭建的双向反射分布函数（BRDF）测量系统对钛合金、铝合金结构件的表面特性展开测量。首先，分析了1550 nm激光通信波长下结构表面粗糙度和入射角度等因素对BRDF分布的影响。然后，建立了结构件表面的BRDF模型，并通过模拟退火算法获得了最优模型参数。实验结果表明，建模结果与实测结果的相对均方根误差优于7.26%，根据实测数据拟合的ABg模型参数为实际工程应用中的杂散光追迹计算和系统设计提供了必要的数据参数。

The surface scattering of structural components in satellite optical communication systems will directly affect the transmission efficiency of signals. Therefore, based on the self-built bidirectional reflection distribution function (BRDF) measurement system, the surface properties of titanium alloy and aluminum alloy structural parts are measured in this paper. The influence of the structure surface roughness and incident angle on the BRDF distribution at the 1550 nm laser communication wavelength is analyzed. The BRDF model of the surface of the structural part is established, and the optimal model parameters are obtained by the simulated annealing algorithm. The experimental results show that the relative root mean square error between the modeling results and the measured results is better than 7.26%. The ABg model parameters fitted according to the measured data provides the necessary data parameters for the stray light tracing calculation and system design in practical engineering applications.