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首页> 外文学位 >Passive range estimation using ship-radiated noise in range-dependent shallow water environments.
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Passive range estimation using ship-radiated noise in range-dependent shallow water environments.

机译：在与距离相关的浅水环境中，使用舰船辐射噪声进行无源距离估计。

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摘要

The motivation for this work is a desire to exploit ship-radiated noise in shallow water environments for the purpose of passive range estimation. The method presented utilizes range-frequency intensity striations, arising from multi-path interference in shallow water waveguides and measured across a horizontal line array, to estimate range between a source and a receiver array. This method is based upon the premise that the effects of waveguide geometry on multi-path interference may be represented by a single parameter, beta, called the waveguide invariant, which relates striation slope to source range.;Much of the literature on striation-based passive range estimation is focused on range-independent environments or relies on the assumption that beta ≈ 1 in shallow water waveguides in order to eliminate the requirement of knowing the specific values of propagation parameters a priori. However, prior work has shown that range-dependent effects from bathymetry or sound speed profiles can cause the value of beta to vary from its canonical shallow water value and introduce significant bias to range estimates. This work specifically focuses on the effects of range-dependent bathymetry in shallow water waveguides and discusses issues surrounding normal mode propagation and mode coupling.;Beyond discussing range-dependent modal propagation, several signal, array, and image processing techniques are presented, which enable estimation of range-frequency intensity images from acoustic data and permit the images to be characterized in terms of striation angle and slope distributions. Using these techniques, a method for estimating range from striation patterns is developed and applied to simulated striation patterns and acoustic data from a 2007 experiment performed off the coast of Port Everglades, Florida. To improve range estimates obtained from the application of this method, an analytical formulation of a waveguide invariant distribution is derived, which takes into account range-dependent propagation parameters using the assumption that propagation satisfies the adiabatic approximation. This generalized waveguide invariant distribution provides a more accurate estimate of beta for use in the range estimation algorithm.;The results of applying the improved range estimation method to simulated and real data are compared, and practical issues of applying this method to acoustic data, including potential performance limitations, such as signal to noise ratio and effective array aperture, are also discussed.
机译：进行这项工作的动机是希望在浅水环境中利用舰船辐射的噪声进行被动范围估计。提出的方法利用了由浅水波导中的多径干扰引起并在水平线阵列上测量的范围频率强度条纹，来估计源阵列和接收机阵列之间的距离。该方法基于这样一个前提，即波导几何形状对多径干扰的影响可以用一个称为波导不变性的单一参数β来表示，该参数将条纹斜率与辐射源范围相关联。被动范围估算着重于与范围无关的环境，或依赖于beta＆ap;为了消除对先验地知道传播参数的特定值的要求，在浅水波导中使用图1中的天线。但是，先前的工作表明，来自测深法或声速剖面的距离相关影响会导致β值不同于其规范的浅水值，并对距离估计值产生明显的偏差。这项工作特别着重于浅水波导中与距离有关的测深法的影响，并讨论了围绕正常模式传播和模式耦合的问题。除了讨论与距离有关的模式传播外，还介绍了几种信号，阵列和图像处理技术，这些技术使从声学数据估计范围频率强度图像，并允许根据条纹角度和斜率分布来表征图像。使用这些技术，开发了一种从横纹图案估计距离的方法，并将其应用于模拟的横纹图案和来自佛罗里达州Everglades港沿海地区的2007年实验的声学数据。为了改进从该方法的应用中获得的距离估计，导出了波导不变分布的解析公式，该公式考虑了传播满足绝热近似的假设，并考虑了与距离相关的传播参数。这种广义的波导不变分布为范围估计算法中使用的beta提供了更准确的估计值;对比了将改进的范围估计方法应用于模拟数据和实际数据的结果，并将此方法应用于声学数据的实际问题包括还讨论了潜在的性能限制，例如信噪比和有效阵列孔径。

著录项

  • 作者

    Sell, Alexander W.;

  • 作者单位

    The Pennsylvania State University.;

  • 授予单位 The Pennsylvania State University.;
  • 学科 Acoustics.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 130 p.
  • 总页数 130
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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