斜入射条件下“猫眼”目标回波功率分析

Analysis of oblique incident angle on retro-reflected wave power in "cat-eye" target

建立了斜入射条件下"猫眼"目标回波功率的计算模型,在此基础上建立了非离焦和离焦两种情况下"猫眼"目标反射的几何模型,推导出非离焦和正负离焦条件下入射角的变化范围,引入有效接收面积概念,得到了正负离焦引起的"猫眼"目标的回波发散角和有效接收面积,得到了斜入射条件下"猫眼"目标的回波功率计算公式,对入射角和离焦量对"猫眼"目标回波功率的影响进行了数值模拟。结果表明:入射角和离焦量的共同作用引起"猫眼"目标有效接收面积和回波发散角的改变,进而引起反射光场能量分布的变化,只有满足特定条件的入射角才能产生回波功率,入射角和离焦量的增大引起回波功率的减小,其中离焦量的变化对回波功率的影响作用显著,当入射角和离焦量都为零时接收到的回波能量最强。

In this paper, the model of oblique incident angle on reflected wave power of ＂cat-eye＂ target is built, moreover the geometrical reflect model of ＂cat eye＂ target when the reflected plane and the focal plane is coplanar or not. The scope of incident angle is educed when the focal shift is positive and negative. The reflected wave angle and effective received area are educed which are induced by the focal shift. The formula of the reflected wave power is educed which is induced by the incident angle and focal shift. The effect of the incident angle and focal shift on the reflected wave power of ＂cat-eye＂ target is analyzed. The study reveals that： the change of incident angle and focal shift both result in the change of the reflected wave angle and effective received area ＂cat-eye＂ target,then induce the change of the reflected wave power. Only the incident angle which meets the limited condition can induce the reflected wave power, the argument of the incident angle and focal sift reduce the reflected wave power, and the change of focal shift has a prominent effect on the reflected power, when the incident angle and the focal shift become zero, the reflected wave power reaches the peak value.