一种基于波束-频域处理的自适应波束形成方法

在天波超视距雷达中 ,通道之间的频响不一致影响了自适应波束形成的性能。去斜处理使得不同距离对应于不同频率 ,故不同距离单元的幅相不一致性与不同的频率相对应。经距离维FFT处理后 ,各路之间的通道不一致性得到降低 ,带内起伏趋于固定。基于上述特性 ,本文提出一种波束 频域处理方法 ,该方法不仅有效对消干扰 ,同时不会恶化天线方向图。更重要的是该方法降低了处理维数 ,减少了计算的复杂度。

An Adaptive Beam-Forming Algorithm Based on the Beam-Frequency Domain Processing

The inconsistency of frequency response between channels degrades the performance of adaptive digital beam-forming in over-the-horizon radar. Different range bins corresponds to different frequency bins after stretching processing. The inconsistency of amplitude and phase of an appointed range bin corresponds to that of a definite frequency bin.The mismatch between channels will be reduced after range FFT,the inconsistency in an appointed frequency bin tends to be a fixed value. Based on the property mentioned above, a beam-frequency domain processing algorithm is presented ,the algorithm can null jammers effectively while avoiding the sidelobe degradation problem. It is more important that the algorithm reduces the processing dimensions and the complexity of computation.