S变换在雷达目标识别中的应用
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
针对雷达目标回波的非平稳特性,推导了S变换及其实现算法,利用电磁场时域有限差分算法仿真了三种军用飞机的宽带散射信号,采用S变换对飞机目标的雷达回波进行时频分析,提取时频分布图的奇异值特征作为目标特征矢量,利用径向基函数神经网络对特征矢量进行训练和学习,最后对三种飞机做了分类识别,取得了很好的识别效果。
A new approach to the time-frequency signal analysis was proposed, using the S transform method, the time-frequency representation that could produce a distribution equal or close to a sum of the Wigner distributions of individual signal components. The new time-frequency signal decomposition method was evaluated on the simulated data using finite difference time domain (FDTD). A new approach of feature extraction was proposed based on singular values of the S transform time-frequency matrix. The RBFNN was employed as the classifier. Results demonstrate that it provides an effective way for radar automatic target recognition. The proposed method could also be used in other signal processing applications.
引文
[1]Stockwell R G,Mansinha L,Lowe R P.Localization of the complex spectrum:The S transform[J].IEEE Transactions on Signal Processing(S1053-587X),1996,17:998~1001.
    [2]Pinnegar C R,Mansinha L.Time-local spectral analysis for non-stationary time series:the S-transform for noisy signals[J].Fluctuation and Noise Letters(S0219-4775),2003,3(3):357-364.
    [3]冯德军,陶华敏,丹梅,等.弹道目标雷达宽带识别仿真与评估[J].系统仿真学报.2006,18(7):225-228.(FENG De-jun,TAO Hua-min,DAN Mei.Simulation and Assessment of Ballistic Target Recognition Using Wideband Radar[J].Journal of System Simulation,2006,18(7):225-228.)
    [4]陈学华,贺振华.改进的S变换及在地震信号处理中的应用[J].数据采集与处理,2005,20(4):449-453.
    [5]王蕴红,刘国岁,李玺,等.基于短时傅里叶变换及奇异值特征提取的目标识别方法[J].信号处理,1998,14(2):123-127.
    [6]张贤达.信号处理中的线性代数[M].北京:科学出版社,1997.
    [7]程广平,王波.基于神经网络的混沌系统状态预测[J].系统仿真学报.2007,19(5):1173-1175.(CHENG Guang-ping,WANG Bo.State Prediction of Chaotic System Based on ANN Model[J].Journal of System Simulation,2007,19(5):1173-1175.)
    [8]李旭,俞集辉.地面附近开口箱孔缝耦合效应的数值仿真[J].系统仿真学报.2007,19(6):1217-1219.(LI Xu,YU Ji-hui.Simulation of Electromagnetic Pulse Coupling into Near Ground Cavity with Aperture[J].Journal of System Simulation,2007,19(6):1217-1219.

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心