| 基于时频变换的弹道目标微多普勒特征提取 |
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| 引用本文： | 田巳睿,蒋跃红,郭汝江,施西野. 基于时频变换的弹道目标微多普勒特征提取[J]. 现代雷达, 2012, 34(1): 40-43 |
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| 作者姓名： | 田巳睿 蒋跃红 郭汝江 施西野 |
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| 作者单位： | 南京电子技术研究所,南京,210039 |
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| 摘 要： | 微多普勒特征是识别弹道目标的重要手段.文中从空间弹道导弹和诱饵散射点微动模型出发,提出了一种基于时频二维像不变矩的微多普勒特征提取方法.该方法首先对导弹和诱饵进行时频变换,然后提取了图像中的7个Hu不变矩作为目标识别的特征.通过仿真实验,分析了特征组合对识别效果的影响,并提出了最优特征组合.文中还评估了特征矢量在不同信噪比条件下的稳定性,试验结果表明,时频像不变矩特征对信噪比变化具有一定的稳定性.
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| 关 键 词： | 微动目标识别 平滑伪Wigner-Ville分布 不变矩 |
Ballistic Target Micro-Doppler Feature Extration MethodBased on the Time-frequency Analysis |
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| TIAN Si-rui,JIANG Yue-hong,GUO Ru-jiang and SHI Xi-ye. Ballistic Target Micro-Doppler Feature Extration MethodBased on the Time-frequency Analysis[J]. Modern Radar, 2012, 34(1): 40-43 |
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| Authors: | TIAN Si-rui JIANG Yue-hong GUO Ru-jiang SHI Xi-ye |
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| Affiliation: | (Nanjing Research Institute of Electronics Technology,Nanjing 210039,China) |
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| Abstract: | According to the mico-motion models of the ballistic targets,a micro-Doppler feature extraction method based on timefrequency analysis and moment invariant is proposed in this paper.In this approach,time-frequency analysis is applied at the very beginning.Then the Hu invariant moments are extracted from the time-frequency imagery.Simulations of precession warhead and swing bait are carried out,whereafter feature combinations are analyzed and the optimized feature vector is achieved.Furthermore, the feature robustness with different SNR is evaluated. |
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| Keywords: | micro-motion target recognition SPWVD moment invariant |
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