入射角对'猫眼'目标特性的影响

摘要

激光雷达截面(LRCS)能够综合表征目标激光散射特性,在激光主动探测系统论证设计、探测性能估算中有广泛的应用.从LRCS定义出发,建立了正入射与斜入射条件下离焦"猫眼"目标的LRCS模型,得到了正入射与斜入射条件下离焦"猫眼"目标的探测距离计算公式,讨论了目标LRCS及主动探测距离随入射角和离焦量变化的规律,对入射角和离焦量对目标LRCS和主动探测距离的影响进行了数值模拟,结果表明:入射角和离焦量的增大会引起"猫眼"目标有效照射面积和回波发散角变小,进而引起LRCS和激光主动探测距离变小.这为激光主动探测系统的设计和性能评价提供了必要的依据.%Laser radar cross section (LRCS) which represents the laser scattering characteristics of a target ,is applied widely in the design and evaluation of the active laser detection systems. Based on the definition of laser radar cross section, a perfect laser radar cross section model of a cat eye target with focal shift is built under the conditions of normai and oblique incidence. The computation formulas of detection distance had also been derived. The rule of LRCS and active detection distance as a function of incidence angle and focal shift had been discussed. Then the impact of incidence angle and focal shift on LRCS and active detection distance is simulated through numerical computation.The results demonstrate that the effective received area of a "cat eye" target and reflected wave divergent angle will attenuate as the incidence angle and fecal shift increase which consequently result in decreasing the LRCS and active laser detection distance. The study will lay the foundation for the design and performance evaluation of various laser detection systems.