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Phase difference auto focusing for synthetic aperture radar imaging
Phase difference auto focusing for synthetic aperture radar imaging
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机译:相差自动聚焦用于合成孔径雷达成像
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摘要
An autofocusing method apparatus for Synthetic Aperture Radar (SAR) are disclosed which employ operation on two or three subarrays (X, Y) of the SAR compressed data to estimate quadratic and cubic phase errors in the data. Focusing of the SAR array may then be accomplished by removing the estimated phase error from the data to sharpen the image. Phase error is estimated by FFT filtering (44) product arrays (X, Y) formed by multiplying (34) the complex conjugate of one subarray (X) by another of the subarrays (Y) to form a correlation function. The correlation functions are integrated (54). A peak detection (56) of the integrated correlation functions yields a peak location in the filter which is proportional to the phase error which may then by calculated. IMAGE
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