基于目标宽带噪声特征的定向技术研究

【作者】 向辉平；

【导师】 罗建；

【作者基本信息】 西北工业大学 ， 通信与信息系统， 2005， 硕士

【摘要】 对于被动声探测设备来说,舰船辐射噪声信号是其唯一的信息来源,它可用于对舰船目标进行声检测,舰船目标识别,以及对目标的定向、定位和跟踪。本文主要研究基于舰船目标宽带辐射噪声的定向技术。论文主要完成以下工作: 首先对舰船作为体积目标的辐射噪声特性进行了分析,采用短时傅立叶变换对不同的舰船通过特性进行了分析,结果表明舰船辐射噪声沿舰船纵向的分布规律可以简化为“三亮点”模型,即中后部主机部分,中部辅机部分和尾部螺旋桨部分,其中尾部辐射的噪声能量占总能量的大部分。然后介绍了几种典型的定位算法,对其性能作了计算机仿真。论文研究了传统时延估计算法由于其在时延估计精度上的局限性,本文采用了一种可以高精度估计任意时延的自适应参量模型法,通过仿真表明,估计精度可满足实际使用的要求。论文第五部分设计了适合水雷引信的使用的阵列信号处理硬件系统。最后采用五元五面体阵和自适应参量模型法估计的时延对目标定向进行了仿真。更多还原

【Abstract】 The ship-radiated noise within a broad frequency range is the only information source of passive acoustic detection. In this thesis, the technology of target localization with war-ship’s wideband radiation noise is studied.First, the method of studying the longitudinal distribution of ship’s radiated noise sources based on time-frequency analyses using short-time Fourier transform was proposed. According to the analysis results and other references, the three highlight model of longitudinal distribution of the ship’s radiated noise sources was proved.Then, several typical localization algorithms are introduced, and their accuracy properties are analyzed. Some traditional methods of time delay estimation are studied. Because the estimation precision is limited, adaptive FIR filter is used to estimate the time delay. It is shown that the method is effective. A micro-power consumption system is designed in chapter 5.Last, the target localization is simulated with estimated time-delay. The result is shown that this method is effective.更多还原