| 基于匹配傅里叶变换的舰船目标成像算法 |
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| 引用本文： | 张云,姜义成.基于匹配傅里叶变换的舰船目标成像算法[J].大连海事大学学报(自然科学版),2009,35(1). |
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| 作者姓名： | 张云 姜义成 |
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| 作者单位： | 哈尔滨工业大学,电子工程技术研究所,哈尔滨,150001
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| 基金项目： | 教育部高等学校博士学科点专项科研基金 |
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| 摘 要： | 为解决逆合成孔径雷达(ISAR)对非合作、机动目标成像时的散焦问题,提出利用瞬时多普勒参数估计补偿相位的成像方法.分析舰船目标的回波特性及其偏航、俯仰、侧摆等转动分量引起的多普勒非线性变化,将回波近似为噪声和杂波背景下的多分量线性调频信号.比较二阶、二步两种匹配傅里叶变换的多普勒参数估计精度.蒙特卡罗实验验证.二步匹配傅里叶变换均具有更好的多普勒分辨力,估计误差较小.利用匹配傅里叶变换估计多普勒频率完成瞬时成像的方法,去除了传统算法中的严重散焦现象,提高了聚焦性能,可获得舰船目标在观测时间内的姿态变化.仿真实验及实测结果验证了该方法的有效性.
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| 关 键 词： | 离散匹配傅里叶变换 舰船 机动目标 瞬时成像 |
A method of ISAR ship imaging based on match Fourier transform |
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| ZHANG Yun,JIANG Yi-cheng.A method of ISAR ship imaging based on match Fourier transform[J].Journal of Dalian Maritime University,2009,35(1). |
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| Authors: | ZHANG Yun JIANG Yi-cheng |
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| Affiliation: | ZHANG Yun,JIANG Yi-cheng(Research Institute of Electronic Engineering Technology,Harbin Institute of Technology,Harbin 150001,China) |
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| Abstract: | Range instantaneous Doppler(RID) algorithm in inverse synthetic aperture radar(ISAR) imaging with compensation was developed to solve the problem of defocusing for non-cooperative maneuvering targets.The echo characteristics of ship target and non-linear Doppler shifts caused by the motion of yaw,pitch and roll were analyzed,and echo was approximated to multi-components chirp signal under noise and clutters background.Doppler parameter estimation accuracies of second order and two-step match Fourier transfo... |
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| Keywords: | discrete match Fourier transform(DMFT) ship maneuvering target instantaneous imaging |
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