SAR DATA FOCUSING USING SEISMIC MIGRATION TECHNIQUES
SAR DATA FOCUSING USING SEISMIC MIGRATION TECHNIQUES
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DOI：
10.1109/7.78293
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发表时间：
1991-03-01
影响因子：
4.4
通讯作者：
ROCCA, E
中科院分区：
文献类型：
--
作者：
CAFFORIO, C;PRATI, C;ROCCA, E
传统的合成孔径雷达（SAR）数据聚焦算法采用匹配滤波器的概念，将数据与随距离变化的参考相位信号进行卷积。所得到的算法是空间变的，其频域实现繁琐。然而，可以使用迁移技术集中SAR数据，这与地球物理中使用的技术非常相似。频率-波数方法是非常有效的：它在性能上几乎达到了最终的结果，具有频域实现的效率。当传感器沿直线飞行时，该方法是精确的，但即使在球形地球和圆形传感器轨迹下，结果也非常好。至少在SAR任务中目前使用或设想的空间分辨率下，可以同时聚焦宽度达100公里的陆地区域，而不会出现严重退化。该算法已经用合成数据、SEASAT-A数据和飞机数据（NASA-AIR）进行了测试。实验结果完全支持理论分析。
Conventional algorithms for synthetic aperture radar (SAR) data focusing use the matched filter concept and convolve the data with a reference phase signal which changes with range. The resulting algorithm is space variant and its frequency domain implementation is cumbersome.SAR data, however, can be focused using migration techniques, quite similar to those used in geophysics. The frequency-wavenumber approach is extremely efficient: it attains almost the ultimate results in performance, with the efficiency of frequency domain implementation. The method is exact when the sensor flies along a rectilinear path, but even with a spherical Earth and a circular sensor trajectory the results are extremely good. Terrestrial swaths as wide as 100 km can be focused simultaneously with no serious degradation, at least with the spatial resolution at present used or envisaged in SAR missions.The algorithm has been tested with synthetic data, with SEASAT-A data and with airplane data (NASA-AIR). The experimental results fully support the theoretical analysis.