多径干扰对防空导弹拦截掠海飞行超低空目标造成严重影响。引入制导雷达和导引头方向图以及修正复反射系数,建立半主动导引头修正“四路径”模型,采用基于物理光学法、等效电磁流法与Z-buffer消隐技术的混合算法,快速、准确地获取海面环境下超低空目标的多径散射,仿真分析了海面风速、雷达工作频率与目标类型对多径散射和信干比的影响。仿真结果表明:半主动体制下,采用VV极化方式,以7°左右的擦地角下视探测掠海飞行超低空目标,能有效抑制多径干扰。仿真结果对防空导弹的弹道设计具有借鉴意义。

Multipath interference has a serious impact on the interception of the ultra-low altitude targets. Guidance radar radiation pattern, seeker radiation pattern and modified complex reflection coefficients are introduced to establish a correctional Four-Path model for semi-active seeker. By using the hybrid method of physical optics, equivalent electromagnetic current and Z-buffer shadowing algorithm, the multipath scattering of ultra-low altitude targets under maritime environment can be obtained quickly and accurately. The variation regulation of multipath scattering and signal-to-interference ratio with wind speed of maritime environment, radar carrier frequency and target category are simulated and analyzed. The simulation results reveal that the multipath interference can be effectively suppressed when semi-active seeker takes the VV polarization mode at approximately 7 degrees to detect the ultra-low altitude targets sweeping over the sea. The simulation results can be used for reference in trajectory design of air defense missile.

TN957

国家自然科学基金资助项目