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| Consistency Study of Minimum Entropy Auto-focusing with Phase Compensation in ISAR Imaging |
| Qiu Xiao-hui①; Zhao Yang②; Alice Heng Wang CHENG③; Siew-Yam Yeo③ |
| ①Dept. of Information Eng., Nanjing University of Post and Telecommunication, Nanjing 210003, China; ②School of Electric and Automation Eng., Nanjing Normal University, Nanjing 210042, China;③Radar Center, Defense Science Organization (DSO) National Laboratory, S’639798, Singapore |
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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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Received: 16 January 2006
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2007, Vol. 29 
