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首页> 外文会议>Algorithms for Synthetic Aperture Radar Imagery XIII >Correction of propagation-induced defocus effects in certain spotlight-mode SAR collections
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Correction of propagation-induced defocus effects in certain spotlight-mode SAR collections

机译：校正某些聚光模式SAR集合中传播引起的散焦效应

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While the chief cause of defocus in airborne spotlight-mode imagery is uncompensated errors in the measurement of the aircraft position as it traverses the synthetic aperture, another physical phenomenon can cause blurring in the formed SAR image as well. This is the injection of phase errors into the collected SAR phase history data by random fluctuations in the index of refraction as the microwave pulses propagate through an atmosphere that contains irregularities in the tropospheric water vapor distribution. In this paper, we show that in SAR imagery collected under certain conditions, these phase errors can be detected and corrected using a robust autofocus algorithm such as Phase Gradient Autofocus (PGA). The phase errors are confirmed as having been propagation-induced by demonstrating that they exhibit a power-law spectrum described by Tatarski, based on the turbulence model of Kolmogorov.
机译：尽管机载聚光模式图像中散焦的主要原因是飞行器位置经过合成孔径时飞机位置测量中的未补偿误差，但另一种物理现象也可能导致形成的SAR图像模糊。这是当微波脉冲传播通过对流层水蒸气分布中包含不规则性的大气时，由于折射率的随机波动将相位误差注入到收集的SAR相历史数据中。在本文中，我们表明，在某些条件下收集的SAR图像中，可以使用鲁棒的自动聚焦算法（如“相位梯度自动聚焦”（PGA））检测并校正这些相位误差。通过根据Kolmogorov的湍流模型证明相位误差表现出Tatarski描述的幂律谱，可以确认相位误差是由传播引起的。

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