为了研究目标光学系统在焦平面反射元件离焦情况下的“猫眼效应”反射特性，采用ZEMAX光学设计及分析软件对“猫眼”目标进行建模和仿真，得出了入射激光通过“猫眼”目标后的能量通过率、后向反射激光束的发散角、远场光斑及其能量分布情况等特性，以及正负离焦量对反射特性影响的区别，并且得出在离焦情况下能够产生“猫眼效应”后向反射光所必需的入射激光束的入射角范围。结果表明，离焦量对“猫眼效应”后向反射光特性有决定性的影响，尤其是对远场光强影响较为显著，这为激光主动探测体制的探测能力分析提供了可靠性依据。

In order to study the laser reflected character of“cat eye effect”of the target's optical system when the reflecting apparatus on the focal plane is focal shift,modeling and simulation for the“cat eye”aim were carried out by using the optical design and analysis software named ZEMAX. Adopting the above method,the reflecting characters were obtained including the energy transit ratio when the incident laser through the“cat eye”aim,the far field divergence,the far field facula and the energy distributing character of the back reflecting laser. Then the different effect from positive and negative focal shift on reflecting character was put forward. At last,the angle range of the incident laser beam was obtained which is necessary for the back reflecting beam of“cat eye effect”when the target optical system is focal shift. The results show that the size of focal shift has a decisive effect on the back reflecting light's characteristic,especially its far field light's intensity. These results provide reliable evidence for the analysis of detecting ability of the active laser detecting system.