宽频带大口径雷达的幅相失真补偿方法

An Amplitude and Phase Distortion Compensation Method of Wide Band and Aperture Radar

当雷达发射信号的瞬时带宽较大时,为满足宽带成像要求,一般需要对系统幅相失真进行补偿。文中介绍了一种针对宽频带大口径地基雷达的系统幅相失真补偿方法,直接利用球形卫星回波数据提取雷达幅相失真函数,同传统方法相比,提高了相位失真函数提取精度,并能够在较低信噪比条件下完成幅相失真补偿函数提取,补偿后的高分辨距离像和逆合成孔径雷达成像质量显著提高。

As the instantaneous bandwidth transmitting signal is wide, to meet the requirement of the wide band imaging, usually the systemic amplitude and phase distortion need to be compensated. A compensation method is introduced for systemic amplitude and phase distortion of wide band and aperture ground based radar. This method makes use of the echoes from globose satellite to extract the amplitude and phase distortion data. Compared with traditional method, it improves the accuracy of the amplitude and phase distortion function extraction. It can also extract the amplitude and phase compensation function extraction under low signal-to-noise ratio. After compensation, the high range resolution profile and inverse synthetic aperture radar imaging quality is improved evidently.