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相关概念视频

Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

82
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
82
Adjusting a Traverse01:12

Adjusting a Traverse

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In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
56
Influence of Earth's Curvature and Atmospheric Refraction on Leveling01:26

Influence of Earth's Curvature and Atmospheric Refraction on Leveling

92
During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance.
92

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相关实验视频

Updated: Jun 27, 2025

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
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改进的阶段到高度映射方法与设备态度相结合.

Shuhuan Han1,2, Yanxi Yang3,4, Xinjie Li1

  • 1School of Automation and Information, Xi'an University of Technology, Xi'an, 710048, China.

Scientific reports
|April 26, 2024
PubMed
概括

本研究引入了一种改进的阶段到高度映射方法,用于3D相位测量分析. 新方法通过将通用回归神经网络与设备态度补偿相结合,提高了准确性并减少了计算需求.

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Evaluating Targeting Accuracy in the Focal Plane for an Ultrasound-guided High-intensity Focused Ultrasound Phased-array System
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相关实验视频

Last Updated: Jun 27, 2025

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科学领域:

  • * 光学与计量学 * 光学与计量学
  • * 计算机视觉和机器学习

背景情况:

  • * 传统的3D相位测量特征测量由于设备的态度变化而面临精度限制.
  • *现有的方法需要广泛的映射方程和内存,影响效率.

研究的目的:

  • * 开发一种改进的阶段到高度映射方法,考虑到设备的态度.
  • *为了提高测量准确度和减少3D形状测量中的计算复杂性.

主要方法:

  • * 获取目标的未封装阶段数据.
  • *采用通用回归神经网络 (GRNN) 来减轻随机设备态度引起的相位偏移.
  • * 通过整合GRNN处理的相位数据来实现改进的阶段到高度映射.

主要成果:

  • * 拟议的方法实现了高质量的阶段到高度映射,使用较少的映射方程和减少内存使用.
  • * 证明了显著的准确性改进:44.30%比概率神经网络 (PNN) 和39.58%比辐射基函数神经网络 (RBFNN) 方法.
  • *成功地弥补了由于设备态度变化的相位偏移.

结论:

  • * 这种新的方法有效地提高了3D相位测量分析的准确性和效率.
  • *基于GRNN的态度补偿为现有的非线性绘图技术提供了优质的替代方案.
  • *这种方法对于需要精确的3D表面重建的应用非常有价值.