| 太赫兹逆合成孔径雷达相位误差分析和补偿方法 |
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| 引用本文： | 刘磊,周峰,陶明亮,张子敬.太赫兹逆合成孔径雷达相位误差分析和补偿方法[J].强激光与粒子束,2013,25(6):1469-1474. |
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| 作者姓名： | 刘磊 周峰 陶明亮 张子敬 |
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| 作者单位： | 1.西安电子科技大学 雷达信号处理国防科技重点实验室, 西安 71 0071 |
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| 摘 要： | 通过对太赫兹逆合成孔径雷达(THz-ISAR)成像原理进行分析，构造目标回波距离维相位误差的多项式表示形式，提出了基于启发式最小熵搜索的二次相位误差校正方法和基于距离维自聚焦的三次及三次以上相位误差校正方法，校正了THz-ISAR回波信号距离维的相位误差，进而消除THz-ISAR一维距离像和二维成像结果中的散焦和展宽现象。理论分析和仿真实验结果都表明该方法能够有效补偿目标回波距离维相位误差，提高一维距离像和二维成像的聚焦效果。
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| 关 键 词： | 太赫兹逆合成孔径雷达 相位误差补偿 最小熵 自聚焦 |
| 收稿时间： | 2012-12-13; |
Method of phase error analysis and compensation for terahertz inverse synthetic aperture radar |
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| Liu Lei,Zhou Feng,Tao Mingliang,Zhang Zijing.Method of phase error analysis and compensation for terahertz inverse synthetic aperture radar[J].High Power Laser and Particle Beams,2013,25(6):1469-1474. |
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| Authors: | Liu Lei Zhou Feng Tao Mingliang Zhang Zijing |
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| Affiliation: | 1.National Laboratory of Radar Signal Processing,Xidian University,Xi’an 710071,China |
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| Abstract: | Terahertz inverse synthetic aperture radar (THz-ISAR) works at high frequency band with short wavelength and large bandwidth. Compared to ISAR operated in microwave band, THz-ISAR is more susceptible to the phase error which will cause the spread and shift of range profiles, thus affect the quality of the two-dimensional (2-D) high resolution image. Based on detailed analysis of the echo model, a method of second order phase error compensation was proposed based on minimizing the entropy of range profiles through enlightened search. In the meantime, another method based on range autofocusing was utilized to compensate the third or higher order phase error. After compensating the phase error through the above methods, well focused high resolution range profiles (HRRPs) and high resolution images were obtained using range-Doppler (RD) algorithm. Theoretical analysis and simulated results verified the effectiveness of this method. |
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| Keywords: | phase error compensation entropy minimization autofocus |
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