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相关概念视频

Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

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Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
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Bode Plots01:26

Bode Plots

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Bode plots are graphical tools that use logarithmic scales for frequency on the x-axis and gain in decibels on the y-axis. This logarithmic method allows a wide range of frequencies to be compactly displayed, enabling the analysis of component effects on circuit behavior across a broad frequency spectrum.
A network function represents the ratio of a system's output to its input, with the magnitude and phase angle derived from the complex network function. The decibel logarithmic gain is...
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一种频率不变的光束成形方法,用于对数排列的双圆形向量水电话阵列.

Chenyang Gui1,2,3, Zhonghao Huo1,2, Weijia Wang1,2

  • 1National Key Laboratory of Underwater Acoustic Technology, Harbin Engineering University, Harbin 150001, China.

The Journal of the Acoustical Society of America
|March 9, 2026
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的双圆阵列和恒束宽度光束成形 (CBB) 方法,以改进船舶噪声测量. 这种新的方法提高了阵列增益,并减少了水下声学应用的错误.

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科学领域:

  • 声学 声学 在声学方面
  • 信号处理 信号处理
  • 阵列信号处理 阵列信号处理

背景情况:

  • 船舶噪声测量系统中的双声阵列因元素利用率低而受到影响.
  • 传统的光束成形方法往往缺乏频率不变性和高效的元素使用.

研究的目的:

  • 提出一个对数分布的双圆阵列和一个恒定光束宽度光束成形 (CBB) 方法.
  • 提高元素利用率,并实现船舶噪声测量系统的频率不变光束成形.

主要方法:

  • 使用连续数组光束模式方程计算最佳元素位置.
  • 从模态域方程中推导频率不变光束模式的补偿函数.
  • 将补偿函数转换为CBB的过器.

主要成果:

  • 与传统嵌套阵列相比,实现了至少6dB的额外阵列增益.
  • 与嵌套方法相比,宽带处理错误减少了45%以上.
  • 已证明适用于向量数组,性能优于标量数组.

结论:

  • 拟议的对数分布式双圆阵列和CBB方法显著提高了船舶噪声测量的性能.
  • 该方法提供灵活的光束图案设计和宽带阵列信号处理的增强性能.
  • 适用于各种水下声学应用,包括辐射噪声测量和目标识别.