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Synthetic-aperture radar processing using fast factorized back-projection

机译:使用快速分解反投影的合成孔径雷达处理

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Exact synthetic aperture radar (SAR) inversion for a linear aperture may be obtained using fast transform techniques. Alternatively, back-projection integration in time domain can also be used. This technique has the benefit of handling a general aperture geometry. In the past, however, back-projection has seldom been used due to heavy computational burden. We show that the back-projection integral can be recursively partitioned and an effective algorithm constructed based on aperture factorization. By representing images in local polar coordinates it is shown that the number of operations is drastically reduced and can be made to approach that of fast transform algorithms. The algorithm is applied to data from the airborne ultra-wideband CARABAS SAR and shown to give a reduction in processing time of two to three orders of magnitude.
机译:可以使用快速变换技术获得用于线性孔径的精确合成孔径雷达(SAR)反演。或者,也可以使用时域的反投影积分。该技术具有处理一般的孔几何形状的好处。然而,在过去,由于沉重的计算负担,很少使用反投影。我们证明了反投影积分可以递归划分,并且基于孔径分解可以构造一种有效的算法。通过以局部极坐标表示图像,表明操作的数量大大减少,并且可以使其接近快速变换算法。该算法应用于机载超宽带CARABAS SAR的数据,结果表明处理时间减少了两到三个数量级。

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