ISAR成像的越距离单元走动校正
Correction of migration through resolution cell in ISAR imaging
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摘要: 逆合成孔径雷达(ISAR)对平稳飞行的目标成像,一般采用简单的距离多普勒(R-D)算法,对于机动目标,由于多普勒的时变特性,对于通常的R-D算法不超越多普勒单元的假设不再成立。该文主要针对大中型飞机,为了得到几十厘米的横向分辨率,特别是在雷达波长不很短时(如 S,L 波段),目标两侧的散射点经常发生越距离单元走动的情况下,讨论了产生越距离单元的原因及补偿方法,计算机仿真和实际数据处理说明本文方法是有效的。Abstract: A simple ISAR range-Doppler algorithm is applicable to steadily small flying target. But for maneuvering target the assumption is not satisfied, as the Doppler frequency is time variant. Actually to obtain the cross-range resolution of dozens of centimeters for the large-scale or medium targets especial for S or L wave band, whose wave length is not short, the Migration Through Resolution Cell (MTRC) would be occurred on the both fringe of the ISAR imaging. In this paper the reason that caused migration through resolution cell is discussed, and a compensating algorithm is proposed. Simulation data and real data prove that this method is effective.
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C.C. Chen, H. C. Andrews, Target-motion-induced radar imaging, IEEE Trans. on AES, 1980,AES-16(1), 2-14.[2]Lu Guangyue.[J].Bao Zheng, Range-instantaneous-Doppler algorithm in ISAR based on instant frequency estimation, Proc. of International Symposium on Multispectral Image Processing (ISMIP98), Wuhan ,China.1998,:-[3]Genyuan Wang, Zheng Bao, Inverse synthetic aperture radar imaging of maneuvering targets based on chirplet decomposition, Opt. Eng. September, 1999, 38(9), 1534-1541.[4]R.P. Perry, R. C. Dipietro, R. L. Fante, SAR imaging of moving targets, IEEE Trans. on AES,1999, 35(1), 188-199.[5]M. Soumekh, Fourier Array Imaging, Englewood Cliffs, NJ: Prentice-Hall, 1994, Ch.5.[6]R.C. DiPietro, R. L. Fante, R. P. Perry, Multi-resolution FOPEN SAR image formation, Part of the SPIE Conference on Algorithms for Synthetic Aperture Radar Imagery VI, SPIE Vol. 3721,1999, 58-67. -
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