ISAR成像的越距離單元走動(dòng)校正
Correction of migration through resolution cell in ISAR imaging
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摘要: 逆合成孔徑雷達(dá)(ISAR)對(duì)平穩(wěn)飛行的目標(biāo)成像,一般采用簡(jiǎn)單的距離多普勒(R-D)算法,對(duì)于機(jī)動(dòng)目標(biāo),由于多普勒的時(shí)變特性,對(duì)于通常的R-D算法不超越多普勒單元的假設(shè)不再成立。該文主要針對(duì)大中型飛機(jī),為了得到幾十厘米的橫向分辨率,特別是在雷達(dá)波長(zhǎng)不很短時(shí)(如 S,L 波段),目標(biāo)兩側(cè)的散射點(diǎn)經(jīng)常發(fā)生越距離單元走動(dòng)的情況下,討論了產(chǎn)生越距離單元的原因及補(bǔ)償方法,計(jì)算機(jī)仿真和實(shí)際數(shù)據(jù)處理說(shuō)明本文方法是有效的。
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關(guān)鍵詞:
- 逆合成孔徑雷達(dá)（ISAR）; 越距離單元走動(dòng)（MTRC）
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. -
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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