基于双雷达微动特征融合的无人机分类识别

章鹏飞; 李刚; 霍超颖; 殷红成

doi:10.12000/JR18061

基于双雷达微动特征融合的无人机分类识别

DOI: 10.12000/JR18061

章鹏飞^1,,
李刚^1, ,,
霍超颖^2,,
殷红成^2,

①.
清华大学电子系北京 100084
②.
北京环境特性研究所北京 100854

基金项目: 装备预研教育部联合基金、装备预研基金重点实验室基金

详细信息

作者简介:
章鹏飞(1989–)，男，江苏人，工程师，清华大学在读硕士研究生。主要研究方向为雷达信号处理与目标识别技术。E-mail: zhang-pf16@mails.tsinghua.edu.cn

李刚：李刚(1979–)，男，2002年和2007年于清华大学电子系分别获得学士、博士学位，现为清华大学电子系研究员、博士生导师，研宄方向为雷达成像、时频分析、稀疏信号处理、分布式信号处理等。E-mail: gangli@tsinghua.edu

霍超颖(1982–)，女，河北人，博士生，高级工程师，电磁散射重点实验室，主要研究方向为雷达特征提取与应用技术。E-mail: 34604336@qq.com

殷红成(1967–)，男，江西人，博士后，研究员，电磁散射重点实验室，主要研究方向为电磁场与微波技术。E-mail: yinhc207@126.com

通讯作者:
李刚 gangli@tsinghua.edu.cn

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出版历程
- 收稿日期: 2018-08-23
- 修回日期: 2018-10-22
- 网络出版日期: 2018-10-28

Classification of Drones Based on Micro-Doppler Radar Signatures Using Dual Radar Sensors

①.
Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
②.
Beijing Institute of Environmental Features, Beijing 100854, China

Funds: Ministry Research Foundation, Ministry Key Laboratory Research Foundation

摘要

摘要: 无人机的日益流行在带来便利的同时也造成了潜在的威胁，对无人机进行分类识别具有重要意义。雷达微多普勒信号能够区分不同类型的无人机。为了提高基于微多普勒的无人机分类的鲁棒性，该文提出了一种多角度雷达观测微动特征融合的无人机识别方法。首先利用多部雷达同时从不同角度观测目标；然后对采集的雷达数据分别进行短时傅里叶变换(Short-Time Fourier Transform, STFT)，得到时频谱图；接着利用主成分分析(Principal Component Analysis, PCA)从时频谱图中提取特征，将两个不同角度雷达传感器得到的特征融合在一起；最后利用支持向量机(Support Vector Machine, SVM)进行训练与分类识别。基于实际雷达数据的实验结果表明：两个雷达传感器观测融合得到的分类精度优于单个雷达传感器的分类精度，最终识别准确率较仅利用X波段雷达传感器方法提升了5%以上。
- 微多普勒 /
- 无人机 /
- 目标识别 /
- 多角度多波段观测
Abstract: Classification of drones is important due to their increasing popularity and potential threats. The micro-Doppler signatures that depend on the rotation of rotor blades facilitate the classification of drones. To enhance the robustness of micro-Doppler based classification of drones, dual radar sensing classification scheme is proposed in this paper. First, time-frequency spectrograms are obtained by performing a short-time Fourier transform on the radar data collected by two radar sensors that have similar angular diversity. Then, principal components analysis is utilized to extract the features from the time-frequency spectrograms and the features obtained by the two radar sensors are fused together. Finally, the classification results are obtained by using the support vector machine. The experimental results show that the classification accuracy obtained by the fusion of dual radar sensors is 5% higher than that obtained by only using a single radar sensor.
- Micro-Doppler /
- Drones /
- Target classification /
- Multi-angle and multi-band observation

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图 1 实验场景几何示意图

Figure 1. The experimental geometry

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图 2 3类无人机示意图

Figure 2. Appearance of the drones

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图 3 典型识别流程

Figure 3. Typical flow chart of radar recognition

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图 4 特征提取与融合流程示意图

Figure 4. The flow chart of feature extraction and fusion with dual radar sensors

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图 5 3种无人机的时频图

Figure 5. Spectrograms of three types of drones

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图 6 实验数据的特征分布

Figure 6. Feature distribution of the experimental data

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图 7 识别率随训练样本比例变化情况

Figure 7. Recognition accuracy under different sizes of training set

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图 8 识别率随加性噪声强度变化情况

Figure 8. Recognition accuracies under different levels of additive Gaussian white noise

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表 1 仅利用K波段雷达传感器识别混合矩阵

Table 1. Confusion matrix using only the K-band radar sensor

目标类型	分类结果
目标类型	四翼机	直升机	六翼机
四翼机	97.74%	0.00%	4.54%
直升机	0.00%	100%	2.67%
六翼机	2.26%	0.00%	92.79%

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表 2 仅利用X波段雷达传感器识别混合矩阵

Table 2. Confusion matrix using only the X-band radar sensor

目标类型	分类结果
目标类型	四翼机	直升机	六翼机
四翼机	90.01%	10.36%	22.38%
直升机	0.36%	88.26%	0.08%
六翼机	9.63%	1.38%	77.54%

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表 3 融合双观测角度的雷达传感器识别混合矩阵

Table 3. Confusion matrix fusing dual-angle radar sensors

目标类型	分类结果
目标类型	四翼机	直升机	六翼机
四翼机	98.88%	0.00%	3.42%
直升机	0.00%	99.69%	1.98%
六翼机	1.12%	0.31%	94.60%

下载: 导出CSV

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