不同战场环境下超低空导弹目标抗多径方法

多径干扰是影响超低空探测的主要因素,针对防空导弹对超低空导弹目标探测问题,研究了不同战场环境下的抗多径方法。采用物理光学法与等效电磁流混合方法(PO+MEC)快速获取导弹目标的电磁散射特性,结合传统的四路径模型,并引入导引头天线方向图对其进行修正,提取出不同战场环境下超低空导弹目标的多径干扰。仿真结果表明,不同的战场环境对应着不同的布儒斯特角,混凝土、半干地、干地和湿地环境下所对应的布儒斯特角分别为30°、26.5°、21.5°和10.5°;当导引头采用VV极化方式以布儒斯特角下视探测超低空导弹目标时,多径干扰达到极小水平,所接收信号的信干比达到极大水平,此时导引头对于超低空导弹目标的探测能力最强,目标回波最为明显。仿真结果对于防空导弹弹道优化具有借鉴意义,为超低空对抗打下基础。

Study on Anti multipath Method of Super low Altitude Missile Target under Diverse Battlefield Environments

Multipath interference is a main factor of having influence on detection in super-low altitude. Anti multipath methods under condition of diverse battlefield environments are studied. By the hybrid method PO+MEC of Physical Optics (PO) and Method of Equivalent Currents (MEC), this paper calculates the electromagnetic scattering characteristic of missile target. Antenna radiation pattern of seeker is introduced to modify traditional Four Path Method (FPM). The multipath interference of super-low altitude missile target under diverse battlefield is extracted. The simulation results show that the different battlefield has corresponding Brewster angle. The Brewster angles of concrete, dry land, half-dry land and wet land environment are 30°, 26.5°, 21.5°and 10.5°respectively. When seeker of air-defense missile takes the VV polarization mode with the Brewster angle to detect super-low altitude missile target, multipath interference reaches minimum level, and the signal to interference radio reaches maximum level. At this moment, the seeker has the best detection capability to super-low altitude missile target and the target echo is the most obvious.