以基于猫眼效应的逆向调制激光通信为应用背景,将猫眼镜头的角失调量转化为线失调量,在柯林斯(Collins)衍射公式的基础上建立了大视场猫眼回波功率分布模型。仿真分析了离焦量、入射角、猫眼口径和焦距对回波功率分布的影响及猫眼回波光束的原路返回特性,并进行了实验验证。结果表明:入射角越大,回波光斑的面积越小,衍射越强烈,且相同入射角下,猫眼的口径越大,焦距越小,回波光斑受入射角的影响就越小;同等离焦量下正离焦回波光斑的发散角小于负离焦;猫眼回波的中心偏移量与入射角和离焦量呈线性关系,且存在一个正离焦量值使回波光束能够原路返回。

Considering the cat-eye effect based retro-modulating laser communication as the application background, a large-field cat-eye echo power distribution model is established based on the Collins diffraction formula by transforming the angular misalignment of the cat-eye lens into a line offset. The effects of the defocusing amount, incident angle, cat-eye diameter, and focal length on the echo power distribution and original return characteristics of the cat-eye echo beam are analyzed and verified with experiments. The results show that the larger the incident angle is,the smaller the echo spot area is,and the stronger the diffraction is. At the same incident angle, the larger the aperture of the cat-eye is, the smaller the focal length is, and the smaller the echo spot affected by the incident angle is. The divergence angle of the positive defocus echo spot at the same defocusing amount is smaller than that of the negative defocus. The center shift of the cat-eye echo varies linearly with both the incident angle and the defocusing amount, and there is a positive defocusing amount that causes the echo beam to return to the original path.