| 高速运动目标的瞬时距离-多普勒成像 |
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| 引用本文： | 张义安,尹治平,王东进,陈卫东.高速运动目标的瞬时距离-多普勒成像[J].中国科学技术大学学报,2009,39(9). |
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| 作者姓名： | 张义安 尹治平 王东进 陈卫东 |
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| 作者单位： | 中国科学技术大学电子工程与信息科学系,安徽合肥,230027 |
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| 摘 要： | 首先建立高速运动目标宽带雷达回波模型,分析了高速运动对目标一维距离像的影响,针对其回波是调频斜率相同的多分量LFM信号的特点,提出利用自适应短时傅立叶变换的方法获得一维瞬时距离像,消除了高速运动目标距离压缩中的色散效应,经过运动补偿和横向分辨,最终获得目标清晰的二维像.和传统速度补偿方法相比,有效减小了运算量,仿真证明了该方法的有效性.
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| 关 键 词： | 高速目标逆合成孔径雷达成像 瞬时距离像 短时傅立叶变换 |
Instant range-Doppler imaging of high speed targets |
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| ZHANG Yi-an,YIN Zhi-ping,WANG Dong-jin,CHEN Wei-dong.Instant range-Doppler imaging of high speed targets[J].Journal of University of Science and Technology of China,2009,39(9). |
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| Authors: | ZHANG Yi-an YIN Zhi-ping WANG Dong-jin CHEN Wei-dong |
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| Abstract: | A target echo model illuminated by wideband linear frequency modulated radar signal was established and the effect of high speed on the target echoes was analyzed.Regarding the characteristic of high speed target echo which consisted of multi-component LFM signal with the same chirp rates,a method based on instant range profile using adaptive STFT was presented.After motion compensation and Fourier analysis in the cross range,a two-dimensional (2D) image would be achieved finally.The preposed method solves the problem of range dispersion of the dechirped echo caused by high-speed and reduces the computation effectively,as demonstrated by computer simulation results. |
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| Keywords: | ISAR imaging of high speed target instant range profile STFT |
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