| 引用本文: | 孙真真,叶伟,陈曾平,等.一种自适应的ISAR图像时－频分析方法.[J].国防科技大学学报,2000,22(6):78-82.[点击复制] |
| SUN Zhenzhen,YE Wei,CHEN Zengping,et al.An Adaptive Method of ISAR Image Time-Frequency Analysis[J].Journal of National University of Defense Technology,2000,22(6):78-82[点击复制] |
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| 一种自适应的ISAR图像时－频分析方法 |
| 孙真真, 叶伟, 陈曾平, 庄钊文 |
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(国防科技大学 自动目标识别重点实验室,湖南 长沙 410073)
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| 摘要: |
| 提出一种自适应的逆合成孔径雷达（ISAR）图像的时频分析方法，它将时频信号分解算法—自适应高斯基表示（AGR）方法与ISAR图像处理相结合。得益于高斯基函数方差的自适应调整，可自动地将图像中的理想点散射中心与非点散射结构区分开来。分别对ISAR图像的径向与横向距离轴进行上述变换，可解构出非点散射中心随角度或随频率变化的特性。应用该方法对仿真数据及飞机目标实测数据所成的ISAR图像进行时－频分析，结果表明该方法正确可行，且物理意义明确。 |
| 关键词: 逆合成孔径雷达图像 时－频分析 散射中心 |
| DOI： |
| 投稿日期：2000-08-06 |
| 基金项目: |
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| An Adaptive Method of ISAR Image Time-Frequency Analysis |
| SUN Zhenzhen, YE Wei, CHEN Zengping, ZHUANG Zhaowen |
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(ATR Lab. of National Univ. of Defence Technology, National Univ. of Defense Technology, Changsha 410073, China)
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| Abstract: |
| A new adaptive time-frequency Inverse Synthetic Aperture Radar (ISAR) image analytical method is presented, which combines the ISAR processing with the time-frequency analysis algorithm-Adaptive Guassian Representation(AGR). This technique uses Guassian basis function to adaptively parameterize the data. And as a consequence, the point-scattering and dispersive-scattering mechanisms can be readily separated based on the width of the Guassian bases. Applying this transformation to range and crossrange axis of ISAR image can extract the frequency-dependent and the aspect-dependent features of nonpoint-scattering centers respectively. The method is tested by using simulation data and real data. The results show that it is a robust tool to post-process ISAR image. And it can provide additional information about the pointlike and dispersive scatting mechanisms that can be useful for ATR. |
| Keywords: Inverse Synthetic Aperture Radar(ISAR) image time-frequency analysis scattering center |
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