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相关概念视频

Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

110
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....
110

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相关实验视频

Updated: Jul 18, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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对于短线性阵列的高分辨率频差束成型.

Xueli Sheng1, Chaoping Dong1, Longxiang Guo2

  • 1Acoustic Science and Technology Laboratory, Harbin Engineering University, Harbin 150001, China.

The Journal of the Acoustical Society of America
|August 23, 2023
PubMed
概括
此摘要是机器生成的。

频差光束成形 (FDB) 方法改善了水下声学到达方向的估计. 新技术提高了阵列光圈,降低了光束宽度,并改善了弱目标检测,克服了传统光束形成的局限性.

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相关实验视频

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科学领域:

  • 水下声学 水下声学
  • 信号处理 信号处理
  • 阵列信号处理 阵列信号处理

背景情况:

  • 传统的光束成形 (CBF) 被广泛用于水下声学到达方向 (DOA) 估计.
  • 与数组间距相对较短的波长的CBF遭受空间别名.
  • 频差束成形 (FDB) 减轻了空间转移,但由于较低频率的更宽的主叶,可能导致DOA性能差.

研究的目的:

  • 提出新的频差光束成形 (FDB) 方法,以提高水下声波阵列的DOA估计性能.
  • 为了解决传统FDB的局限性,特别是更宽的主叶片和较短数组和大间距的较差性能.
  • 在存在强大的干扰时,改进弱目标检测能力.

主要方法:

  • 开发第四阶累积FDB方法,将数组光圈虚拟扩展到2M-1元素.
  • 引入一种联合增强的FDB方法,将数组光圈虚拟扩展到4M-3元素.
  • 在干扰下分析光束宽度,侧叶水平和弱目标检测.

主要成果:

  • 与传统的FDB相比,拟议的FDB方法产生显著更窄的光束和较低的侧叶水平,用于距离较长的短阵列.
  • 实现了更好的DOA性能,特别是在具有挑战性的场景中.
  • 证明了在强干扰中检测弱目标的增强能力.

结论:

  • 拟议的第四阶累积物和合增强FDB方法有效地克服了用于水下声学DOA估计的传统FDB的局限性.
  • 这些新的方法在光束成形分辨率和干扰拒绝方面提供了卓越的性能.
  • 通过模拟和实验数据的验证证实了拟议技术的实际适用性和有效性.