在浅海水声定位系统中,针对传统声呐信号持续时间长、效率低、正交性差的问题,提出了一种抗噪声、快速、窄带的水声混沌信号.通过推导Logistic混沌序列的混沌性和相关特性;并据此将具有混沌特性的相位信息对混沌序列进行调制.理论表明调制后的水声混沌信号具有正的Lyapunov指数、理想的相关性和窄带性.水域数据分析显示,水声混沌信号依旧表现出混沌性和窄带性;并且与同水域实验的m序列相比,定位精度提高了5 cm左右,信号时长缩短了73 ms,为海洋中动态目标的快速定位提供了参考.%In the shallow water acoustic localization systems,a kind of underwater acoustic chaotic signal that is anti-noise,fast and narrowband is proposed for tranditional sonar signal being a long time,low efficiency and poor orthogonality.The chaos and correlation properties of Logistic chaotic sequences are dericed, and the chaotic sequence is modulated by the phase information with chaotic characteristics.The theory shows that chaotic modulated signal of underwater acoustic chaotic signal has a positive Lyapunov exponent, ideal correlation and narrowband.Analysis of water experimental data show that underwater acoustic chaotic signal still puts up chaotic characteristics and narrowband,and compares with the m-sequence that the positioning accuracy improves the 4 cm and the time of signal is shortened 73 ms at the same waters.It provides a reference for the rapid localization of the dynamic target in the ocean.
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