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传统的机载雷达自适应杂波抑制多是从时域角度来考虑的 ,提出了一种基于频域的杂波抑制方法———FFT频域处理法。该方法将输入数据首先经过FFT运算变换到频域上 ,然后利用质量中心法来估计杂波谱的中心多普勒频率和带宽 ,最后将杂波分布区内的FFT通道输出置零 (即滤除杂波 )。实验仿真结果表明 ,与传统的基于谱估计的自适应MTI方法相比 ,该方法具有良好的改善因子和较小的信噪比损失 ,对于慢速目标检测十分有利 ,并能有效地防止目标白化 ,其运算简单 ,适于工程实现。
The traditional airborne radar adaptive clutter suppression is considered from the time domain point of view, a clutter suppression method based on frequency domain - FFT frequency domain processing method is proposed. In this method, the input data is first transformed to the frequency domain by FFT operation, and then the center Doppler frequency and bandwidth of the clutter spectrum are estimated by the mass center method. Finally, the FFT channel output in the clutter distribution area is set to zero Clutter). Experimental results show that compared with the traditional adaptive MTI method based on spectral estimation, this method has a good improvement factor and a small loss of signal-to-noise ratio, which is very beneficial for slow target detection and can effectively prevent the target albino , Its operation is simple, suitable for project implementation.