Journal of Russian Laser Research ( IF 0.9 ) Pub Date : 2021-03-01 , DOI: 10.1007/s10946-021-09952-7 Lun Jiang , Xin Yu , Chao Wang , Tianjun Dai , Zhengshuang Dai , Shoufeng Tong
We study the influence of altitude and speed on aero-optic imaging quality degradation of new laser communication system “Multi-Aperture Transmission and Diversity Reception” of surface-to-air missile. The 3D modeling and meshing of surface-to-air missile are obtained by ANSYS software. The density field distribution around the optical system was analyzed by FLUENT and the nonuniform refractive-index field around is calculated, in view of the Gladstone–Dale relation. The point spread function (PSF), Strehl ratio (SR), encircled energy, and modulation transfer function (MTF) are provided for the imaging quality evaluation of optical system. The altitude ranges from 0 to 20 km, and the speeds of missile are 5 and 3 Ma. The results show that, at the constant speed, with increase in the altitude, the refraction index and the radius of dispersion spot including 80% energy are gradually decreasing; the SR results and the curve of MTF are gradually increasing, and the PSF is concentrated. At the constant altitude, with increase in the speed, the aerodynamic flow field becomes more and more complex. Therefore, the higher the altitude, the better the receiving quality, and the smaller the speed, the better the receiving quality.
中文翻译:
新型气动环境下导弹激光通信系统成像质量分析
我们研究了高度和速度对地空导弹新型激光通信系统“多孔径发射和分集接收”的航空光学成像质量下降的影响。地空导弹的3D建模和网格划分是通过ANSYS软件获得的。结合Gladstone-Dale关系,通过FLUENT分析了光学系统周围的密度场分布,并计算了周围的非均匀折射率场。提供了点扩展函数(PSF),斯特列尔比(SR),环绕能量和调制传递函数(MTF),用于评估光学系统的成像质量。高度范围从0到20 km,导弹的速度分别为5和3 Ma。结果表明,在恒定速度下,随着海拔的升高,含80%能量的色散点的折射率和半径逐渐减小。SR结果和MTF曲线逐渐增大,PSF集中。在恒定高度下,随着速度的增加,空气动力流场变得越来越复杂。因此,海拔越高,接收质量越好,速度越小,接收质量越好。