论文部分内容阅读
水下弱信号的检测和识别是当今水声信号处理领域中存在的难题．应用混沌、分形理论，从根空间轨迹、Lyapunov指数和关联维等方面研究了船舶辐射噪声的混饨现象，发现船舶辐射噪声信号的确存在混沌吸引子，且不同类别的信号具有不同的吸引子维数．这一结果将为水声信号处理，为水下目标探测和识别提供崭新的理论手段。
The detection and identification of underwater weak signals are the problems existing in the field of underwater acoustic signal processing. The chaos and fractal theory are applied to study the chaos mixing phenomenon of ship radiated noise from root space trajectory, Lyapunov exponent and correlation dimension. It is found that there exist chaotic attractors in the radiated noise signals of ships and different types of signals have different attractor dimensions number. The result will be underwater acoustic signal processing, providing a new theoretical means for underwater target detection and identification.