雷达导引头俯视探测超低空目标时,受多径效应的影响,严重降低了跟踪的精度。将弹目视线角约束在布儒斯特角附近,可有效降低多径干扰的影响。基于滑模控制原理,设计出一种改进的自适应双滑模面末制导律。该制导律可确保在跟踪拦截目标的过程中,将弹目视线角约束在布儒斯特角附近,从而最大限度地降低多径干扰对跟踪精度的影响。针对滑模的抖振问题,采用高增益连续函数代替符号函数,大大改善了超低空拦截性能。

When the radar seeker is overlooking and detecting the ultra low altitude target, the tracking accuracy is significantly reduced because of multipath effect. When the line-of-sight angle is restricted near the Brewster angle, it can effectively reduce the multipath interference. Based on the principle of sliding mode control, an improved terminal guidance law of adaptive double sliding mode surface is designed. This guidance law can make the line-of-sight angle restricted near the Brewster angle, which can minimize the influence of multipath effects on the tracking precision. For the chattering problem of sliding mode control, the high gain continuous function is used instead of sign function, which greatly improves the interception performance of the ultra-low altitude target.