卫星激光测距中光束亮度的偏振影响及应用

发布时间：2018-04-23 23:42

本文选题：卫星激光测距 + 偏振方向　；参考：《红外与激光工程》2016年03期

【摘要】：卫星激光测距(Satellite Laser Ranging,SLR)常利用激光大气后向散射所形成的图像来引导光束指向,而光束图像亮度随天区变化的现象在SLR站普遍存在,影响了激光对卫星的瞄准。以中国科学院上海天文台现有SLR系统为研究平台,阐明了该现象的成因,即光束图像成像光路中分光镜的效率会随偏振方向改变而变化。据此提出偏振方法,通过建立出射激光偏振方向随望远镜位置变化模型,改变发射光路中新引入半波片的角度,实现了光束图像于不同亮度的实时控制。相比使用消偏振分光镜的方案,该方法具有应用灵活、系统简单且成本低的优势,研究成果在提高激光对卫星的瞄准精度及星象图像信噪比等方面具有重要意义。
[Abstract]:The Satellite Laser Ranging (SLR) often uses the image formed by the laser backscattering of the laser atmosphere to guide the beam direction, and the phenomenon of the brightness of the beam image varies with the sky area in the SLR station, which affects the aim of the laser on the satellite. The existing SLR system of Shanghai Astronomical Observatory.CAS is the research platform, and the results are expounded. The cause of the phenomenon is that the efficiency of the optical splitter in the light path of the beam image will change with the polarization direction. Accordingly, the polarization method is proposed. By establishing the model of the polarization direction of the laser beam with the change of the telescope position, the angle of the newly introduced half wave plate in the emission light path is changed, and the real-time control of the beam image in different luminance is realized. Using the scheme of depolarization optical splitter, this method has the advantages of flexible application, simple system and low cost. The research results are of great significance in improving the laser's aiming precision of the satellite and the signal to noise ratio of the image of the stars.

【作者单位】：中国科学院上海天文台;中国科学院空间目标与碎片观测重点实验室;
【基金】：国家自然科学基金(11303074,u1231107) 上海市空间导航与定位技术重点实验室基金(06D22101) 测绘地理信息公益性行业科研专项经费(201412001)
【分类号】：P228.5

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