关于主瓣干扰抑制技术的研究

天波超视距雷达中，天线的主瓣方向与副瓣方向一样，也会引入大量的干扰，导致脉冲压缩后目标信号淹没在干扰的旁瓣之中。利用最小二乘法和特征子空间投影的方法来抑制主瓣干扰，分析比较了它们的抑制性能。结果表明：最小二乘法实现简单，能较好的抑制小功率的干扰，而特征子空间投影的方法对于大功率的输入干扰，抑制效果更好；实际中将两种方法相结合，可取得不错的效果。

Research on suppression technology of mainlobe interference

For the sky-wave over-the-horizon(OTH) radar, much powerful and crowded interferences are introduced not only from the sidelobe direction but also from the mainlobe direction, which results in target signal be masked in the sidelobes of interference after pulse compression. In this paper, the least square(LS) and eigen-subspace projection methods are proposed to suppress mainlobe interferences. The simulation performance comparison of two algorithms are given. It is concluded that the LS algorithm is easy to implement and can suppress less powerful interference, the eigen-subspace projection algorithm has a better performance for more powerful interference. In practice, the perfect performance will be obtained by combining these two methods.