摘要
基于非线性动力学理论的水声信号相空间处理，是水声信号处理的一种新途径。实际水声信号在相空间中分析时的首要问题是降噪。本文应用局部几何投影法提取不同目标辐射噪声的低维成分，输出相图呈现出较明显的低维吸引子。在此基础上，用吸引子维数和反映动力学模型差异的交叉预测误差对样本进行了分类研究，结果表明，综合这两种分别反映几何性质和动力学性质的特征，可达到一定的分类效果。
Signal processing in phase space based on nonlinear dynamics theory is a new method for underwater acoustic signal processing. One key problem when analyzing actual acoustic signal in phase space is how to reduce the noise and lower the embedding dimension. In this paper, local-geometric-projection method is applied to obtain low dimension element from various target radiated noise and the output phase portraits show obvious low dimension attractors. After that, attractor dimension and cross prediction error are used for classification. It concludes that combining these features representing the geometric and dynamical properties respectively shows effects in target classification.
出处
《声学学报》
EI
CSCD
北大核心
2000年第5期416-420,共5页
Acta Acustica
关键词
水声目标辐射噪声
低维动力学
成分提取
Acoustic noise
Acoustic signal processing
Dynamics
Feature extraction
Geometry
