半主动防空导弹具有制导作用距离远,弹上设备简单,导引头成本低廉等优势。但面临隐身目标时,地面制导雷达照射功率不断加大,目标回波功率却越来越小,从回波天线后瓣入射的直波杂散信号严重影响导引头工作灵敏度。文中创造性提出基于空域对消的直达波抑制技术,以直波天线为辅助通道,回波天线为主通道实现对进入回波通道强直达波的自适应抑制,提高了导引头在超强照射背景下对隐身目标的稳定跟踪能力。

The semi-active missile is the important component of the air defense weapon system, with further guidance range, higher reliability as well as lower cost and less maintenance technical difficulty. Nowadays with the growing requirement for striking stealth targets, more radiation power of the guidance radar is required. In this situation,, the direct-wave signal spurious will severely affects the performance of system sensitivity. To solve this problem, a new method of direct-wave suppression based on spatial cancellation is first proposed. The simulation results show that the direct-wave which entered into echo channel can be suppressed adaptively. The tracking stability for stealth targets of semi-active seeker under intense radiation circumstance is improved obviously.