卫星角反射器作为激光测距系统中的合作目标, 其主要作用在于提高地面接收机范围内反射光束的能量密度。经卫星角反射器返回的光束能量分布与角反射器加工参数有很大关联。基于角反射器的几何结构模型, 采用矢量形式的折反射定律, 建立了在不同光束入射条件下, 具有二面角和面形误差的角反射器的出射光场的相位分布和远场衍射模式的数学模型。针对圆形切割的角反射器, 仿真计算了不同光束入射角及方位角、角反射器二面角和面形误差所对应的远场衍射模式, 并详细分析了它们对远场衍射模式的影响规律。仿真结果表明, 随着二面角误差、面形误差和光束入射角的增加, 远场衍射强度的发散程度增加。根据远场衍射模式和速差补偿理论, 提出了一种在较大观测范围内二面角速差补偿方法。

Satellite retroreflector is used as laser ranging cooperative target to improve the intensity of reflected beam, which has close relationship with processing parameters of the retroreflector. Based on geometrical structure of retroreflector and vector form of reflection-refraction law, mathematical models with phase distribution of returned beam, and far-field diffraction pattern (FFDP) are built up for retroreflector with dihedral angle error and flatness error. As for retroreflector with circular section, FFDP under different incident conditions of laser beam, dihedral angle error and flatness error is simulated. Meantime, the rules of their effect on FFDP are analysed at length. Simulated results express that the divergence of FFDP is increased with dihedral angle error, flatness error and laser incident angle. In terms of FFDP and velocity aberration compensation theory, a new method of using dihedral angle offset for compensating velocity aberration in large observation range is put forward.