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讨论了有关合成孔径雷达(SAR)地面图像轨迹失真的自适应校正问题。文中提出的方法属于自适应自聚焦方法中的一种,这种方法采用反射探测信号来纠正轨迹误差信息。将多普勒频谱位移及其高阶导数在斜距范围取平均得到的估值作为信息参数。这样就为建立这种自适应算法提供了可能,即它不仅能够自动校正飞行速度误差,而且还能够校正加速度和突跳误差。给出了SAR信号处理的结果,讨论了不同条件下信号处理的特性以及所提方法的实现结果。
The problem of adaptive correction of the ground image path distortion in Synthetic Aperture Radar (SAR) is discussed. The proposed method is one of the adaptive self-focusing methods. This method uses the reflected detection signal to correct the trajectory error information. The estimation obtained by averaging the Doppler shift of the spectrum and its higher derivatives over the slant range is used as the information parameter. This makes it possible to establish such an adaptive algorithm that not only automatically corrects flight speed errors, but also corrects acceleration and kick errors. The results of SAR signal processing are given, and the characteristics of signal processing under different conditions and the implementation results of the proposed method are discussed.