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山东大学学报 (工学版) ›› 2020, Vol. 50 ›› Issue (3): 8-14.doi: 10.6040/j.issn.1672-3961.0.2019.062

• 机器学习与数据挖掘 • 上一篇    下一篇

一种Chirplet神经网络自动目标识别算法

李怡霏(),郭尊华*()   

  1. 山东大学(威海)机电与信息工程学院, 山东 威海 264209
  • 收稿日期:2019-02-14 出版日期:2020-06-20 发布日期:2020-06-16
  • 通讯作者: 郭尊华 E-mail:liyifei13@mail.sdu.edu.cn;gritty@sdu.edu.cn
  • 作者简介:李怡霏(1994—),女,广西桂林人,硕士研究生,主要研究方向为信号处理和目标识别. E-mail: liyifei13@mail.sdu.edu.cn
  • 基金资助:
    国家自然科学基金资助项目(61401252)

A Chirplet neural network for automatic target recognition

Yifei LI(),Zunhua GUO*()   

  1. School of Mechanical, Electrical & Information Engineering, Shandong University(Weihai), Weihai 264209, Shandong, China
  • Received:2019-02-14 Online:2020-06-20 Published:2020-06-16
  • Contact: Zunhua GUO E-mail:liyifei13@mail.sdu.edu.cn;gritty@sdu.edu.cn
  • Supported by:
    国家自然科学基金资助项目(61401252)

摘要:

针对飞机目标的自动识别问题,提出一种联合特征提取与分类的Chirplet神经网络方法,实现一维高分辨率距离像的识别。Chirplet神经网络将Chirplet原子变换用于多层前馈神经网络结构的输入层,替换传统的激励函数对距离像序列进行特征提取;网络的分类部分由隐层和输出层组成。在训练过程中调整神经网络权值的同时,完成对Chirplet原子时频参数的自动调整,协调优化特征参数和分类器参数,使Chirplet神经网络同时实现特征提取和目标分类。对4类飞机目标的仿真测试结果表明,相比时频变换和Gabor原子网络等方法,具有四特征参数的Chirplet神经网络方法具有较高的识别率和抗噪性能。

关键词: 自动目标识别, 高分辨率距离像, Chirplet神经网络

Abstract:

Aiming at automatic target recognition of aircrafts, a Chirplet neural network for joint feature extraction and target classification was proposed to realize recognition of one-dimensional high resolution range profiles. Based on the multilayer feedforward neural network structure, the Chirplet-atom transform was used to replace the conventional excitation function in the input layer for feature extraction, and the hidden layer and output layer constituted the classifier of the network. The network weights and the parameters of Chirplet-atom node were simultaneously adjusted and optimized to achieve joint feature extraction and target classification. The simulation results of the four types of aircrafts showed that the Chirplet neural network method with the four-feature-parameters had higher recognition rate and anti-noise performance than the time-frequency transformation and Gabor atoms network.

Key words: automatic target recognition, high resolution range profile, Chirplet neural network

中图分类号: 

  • TP183

图1

Chirplet神经网络结构图"

图2

四类目标归一化原始距离像"

表1

0°~45°方位角的识别率"

识别方法 识别率/% 训练耗时/s
YF22 J6 F117 B2
距离像 78.3 86.7 78.7 84.7 6.70
FFT 89.5 94.0 88.1 95.8 9.89
Gabor变换 91.7 95.8 89.6 96.3 7.54
Chirplet变换 92.3 96.9 90.6 96.7 8.59
小波神经网络 94.3 96.8 92.0 96.4 0.96
Gabor原子网络 95.1 99.1 96.7 97.6 1.22
Chirplet神经网络 97.7 99.8 97.0 98.1 2.13

表2

0°~90°方位角的识别率"

识别方法 识别率/% 训练耗时/s
YF22 J6 F117 B2
距离像 76.3 82.4 73.8 82.3 8.90
FFT 80.9 89.8 80.5 95.7 12.41
Gabor变换 82.3 88.3 81.6 96.0 9.39
Chirplet变换 82.5 92.6 83.2 95.5 12.86
小波神经网络 83.2 90.7 80.8 94.5 10.57
Gabor原子网络 85.3 93.8 85.2 96.7 23.38
Chirplet神经网络 87.2 95.3 86.5 96.8 29.50

表3

0°~180°方位角的识别率"

识别方法 识别率/% 训练耗时/s
YF22 J6 F117 B2
距离像 72.8 80.9 71.0 80.2 13.00
FFT 74.8 83.0 74.2 96.6 21.22
Gabor变换 77.6 86.7 77.5 96.3 14.91
Chirplet变换 78.0 92.0 79.8 96.8 20.07
小波神经网络 79.3 89.8 81.9 94.8 32.34
Gabor原子网络 83.1 91.8 82.5 95.7 137.69
Chirplet神经网络 83.9 92.1 84.7 96.0 156.22

图3

Chirplet神经网络和Gabor原子网络在不同信噪比条件下的识别率"

表4

SNR=5 dB,方位角0°~180°数据的识别率"

识别方法 识别率/%
YF22 J6 F117 B2
距离像 44.9 48.6 49.5 46.0
FFT 55.1 53.4 51.3 69.8
Gabor变换 51.6 52.2 48.0 67.4
Chirplet变换 59.8 51.4 54.1 73.4
小波神经网络 65.7 76.5 71.4 74.7
Gabor原子网络 72.8 74.5 70.1 76.8
Chirplet神经网络 75.5 77.3 74.2 75.1
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