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兵工学报 ›› 1996, Vol. 17 ›› Issue (1): 55-59.

• 论文 • 上一篇    下一篇

直升机声信号特征提取和识别技术

李在庭、 高德勇、 何遵文   

  1. 北京理工大学,北京,100081
  • 收稿日期:1994-12-01 修回日期:1995-11-01 上线日期:2014-12-25
  • 通讯作者: 李在庭

The Extraction and Recognition of Sonic-Signals from Helicopters

Li Zaiting, Gao Deyong, He Zunwen   

  1. Beijing Institute of Technology, Beijing, 100081
  • Received:1994-12-01 Revised:1995-11-01 Online:2014-12-25
  • Contact: Li Zaiting

摘要: 简要介绍了直升机的飞行噪声和它的频域特征,论述了声信号特征的提取技术。采用基于模式识别的信息处理方法,用AR模型参数谱估计算法高质量地估计了直升机的声线谱;用二次近似法快速有效地提取了直升机的声线谱特征,构成特征矩阵;用模式识别中旬法分析方法对声目标进行有效的判决、识别,并编写了相应的程序,给出了分析结果,效果良好。

关键词: 直升机 , 声信号特征提取 , 模式识别

Abstract: The in-flight sonic noise of helicopters and its characterization in frequency domain are briefly presented, and followed by a discussion on the extraction of charac?teristics of sonice-signal. Adopting signal processing based on modal recognition, the line spectrum of helicopter sonic noice is obtained through AR modal parameter spec?trum estimation attaining a high quality. The characteristics of line spectrum can be ob?tained quickly and effectively by 2nd order approximation, forming characteristic matri?ces, and the sonic-target recognized effectively by way of syntactic analysis in modal recognition. The results of analysis obtained in this way appear to be satisfactory.

Key words: helicopter , extraction of sonic-signal characteristics , modal recognition