一种Chirplet神经网络自动目标识别算法

doi:10.6040/j.issn.1672-3961.0.2019.062

摘要/Abstract

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

李怡霏,郭尊华. 一种Chirplet神经网络自动目标识别算法[J]. 山东大学学报 (工学版), 2020, 50(3): 8-14.

Yifei LI,Zunhua GUO. A Chirplet neural network for automatic target recognition[J]. Journal of Shandong University(Engineering Science), 2020, 50(3): 8-14.

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识别方法	识别率/%				训练耗时/s
识别方法	YF22	J6	F117	B2	训练耗时/s
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

识别方法	识别率/%				训练耗时/s
识别方法	YF22	J6	F117	B2	训练耗时/s
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

识别方法	识别率/%				训练耗时/s
识别方法	YF22	J6	F117	B2	训练耗时/s
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

识别方法	识别率/%
识别方法	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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