ISAR成像最小熵自聚焦与相位补偿的一致性分析
doi: 10.3724/SP.J.1146.2006.00072
Consistency Study of Minimum Entropy Auto-focusing with Phase Compensation in ISAR Imaging
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摘要: 该文对ISAR成像的最小熵自聚焦(Minimum Entropy Auto-focusing，MEA)与相位补偿之间的一致性问题进行深入研究，文中的数学推导证明了对于ISAR距离-多普勒成像，相位补偿后的剩余相位误差为0时的相位补偿量不一定是 ISAR图像熵函数的极小点，这与ISAR成像目标有关。仿真实验也表明使ISAR图像熵最小时的相位补偿剩余相位误差却未必为0，只有当目标本身的图像熵不大于任何非零剩余相位误差所对应的成像结果的熵时，ISAR成像的最小熵自聚焦才与相位补偿一致。Abstract: The problem of inherent consistency between phase compensation and Minimum Entropy Auto-focusing (MEA) method in ISAR imaging is investigated in this paper. The mathematical analysis in the paper proves the conclusion that, for ISAR range-Doppler imaging, the phase compensating component probably may not be the extreme value of image entropy function when the residual translational phase is equal to zero after phase compensation being completed, and this is concerned with ISAR imaging target. Simulation experiment also shows that the residual translational phase may not surely be equal to zero to make the image entropy minimal. However only when the image entropy of target itself is not larger than those imaging entropies corresponding to any non-zero residual translational phase can the consistency be achieved between minimum entropy auto-focusing and phase compensation in ISAR imaging.
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