主瓣干扰下混合极化系统单脉冲角度估计方法

Angle estimation with hybrid polarimetric radar in main-lobe barrage interference

当压制干扰源与目标方向相临近时,雷达天线对干扰信号的接收增益很大,形成主瓣压制干扰,对雷达目标检测、角度测量与跟踪构成严重威胁。运用极化滤波手段可以有效抑制主瓣压制干扰、提升雷达目标检测能力,但其滤波输出数据中的目标单脉冲比受到剩余干扰、目标交叉极化耦合等诸多因素影响,导致角度测量存在偏差。这某些情况下,这种角度偏差将难以忽略,甚至导致测角完全失效。本文基于混合极化单脉冲系统,本文提出一种抗主瓣压制式干扰的目标角度估计方法,通过对正交极化和、差通道的极化滤波与极化综合,实现目标角度无偏估计,完善了极化滤波方法在单脉冲系统中的应用。

When the angle of the barrage interference source gets close to the target, the antenna gain for the interference becomes large, and the main-lobe barrage interference scenario is created, which leads to wrong detection, erroneous angle measurements and error tracking for the radar-guidance system. By polarization filte- ring, the interference can be suppressed effectively, however, a bias connected with the residual interference and the cross-polarization component of target echo is also introduced in. Under some conditions, this bias be- come too large to be ignored, which may invalidate the monopulse measurement. By polarization filtering and polarization synthesis of sum and difference channels with two orthogonal polarization, an unbiased target angle estimation based on hybrid-polarimetric system is developed.