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相关概念视频

IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

955
IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
955
Design Example01:23

Design Example

348
The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
348

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相关实验视频

Updated: Jul 24, 2025

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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通过基于FastICA算法的FDA-MIMO雷达进行SMSP主叶阻塞抑制.

Pengfei Wan1,2, Guisheng Liao1, Jingwei Xu1

  • 1National Key Laboratory of Radar Signal Processing, Xidian University, Xi'an 710071, China.

Sensors (Basel, Switzerland)
|July 8, 2023
PubMed
概括

这项研究引入了一种新的频率多元阵列 (FDA) 多输入多输出 (MIMO) 雷达的新方法,以抑制涂抹频谱 (SMSP) 干扰. 该技术显著提高了雷达目标搜索性能,即使在低信号噪声条件下.

关键词:
盲目源分离的方法频率多样化的阵列数组.最大的方法最大的方法.多个输入多个输出.涂抹的频谱干扰

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相关实验视频

Last Updated: Jul 24, 2025

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科学领域:

  • 雷达系统工程 雷达系统工程
  • 电子战是一种电子战.
  • 信号处理 信号处理

背景情况:

  • 基于地面的雷达目标搜索被电子战环境中的涂抹频谱 (SMSP) 干扰降低了.
  • 传统的线性频率调制 (LFM) 雷达正在与自卫干扰器的SMSP干扰作斗争.
  • 有效的干扰抑制对于保持雷达性能至关重要.

研究的目的:

  • 为FDA-MIMO雷达提出一种新的SMSP主叶干扰抑制方法.
  • 提高雷达在干扰条件下运行的目标搜索能力.
  • 为了提高雷达检测概率和信号分离精度.

主要方法:

  • 使用频率多元阵列 (FDA) 多输入多输出 (MIMO) 雷达系统.
  • 使用最大算法来估计目标角度和去除侧叶干扰.
  • 应用盲源分离 (BSS) 算法,通过利用范围-角度依赖来分离主叶干扰和目标信号.

主要成果:

  • 目标回声信号与干扰成功分离.
  • 对于分离的目标信号,实现了超过90%的相似系数.
  • 显著提高了雷达检测概率,特别是在低信号噪声比率下.

结论:

  • 拟议的FDA-MIMO雷达方法有效地抑制了SMSP主叶干扰.
  • 该技术保持了高目标回声信号完整性,并提高了检测性能.
  • 这种方法在具有挑战性的电子战场景中为雷达目标搜索提供了强大的解决方案.