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相关概念视频

Errors in Global Positioning System01:26

Errors in Global Positioning System

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Global Positioning System (GPS) technology has revolutionized navigation and positioning, but its accuracy is often compromised by various errors. These errors, stemming from environmental, satellite, and receiver-related factors, require careful mitigation to ensure reliable performance across applications.Atmospheric ErrorsGPS signals travel through the Earth’s ionosphere and troposphere, introducing delays which affect accuracy. The ionosphere is strongly influenced by charged particles,...
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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over...
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Mechanistic models play a crucial role in algorithms for numerical problem-solving, particularly in nonlinear mixed effects modeling (NMEM). These models aim to minimize specific objective functions by evaluating various parameter estimates, leading to the development of systematic algorithms. In some cases, linearization techniques approximate the model using linear equations.
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The compass is a fundamental instrument that operates by aligning its magnetic needle with Earth's magnetic field. This alignment facilitates navigation and orientation, offering a means to determine direction relative to magnetic north. However, the magnetic needle points to magnetic north, which differs slightly from true geographic north due to magnetic declination, which is the angular deviation between these two points. Declination varies based on geographic location and shifts over time...
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Local Attraction01:22

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Local attraction refers to disturbances in compass readings caused by magnetic influences from nearby objects such as metal fences, buried pipes, vehicles, buildings, power lines, or natural iron ore deposits. Small items like wristwatches, steel tools, or belt buckles can also interfere with the compass by creating local magnetic fields that distort the Earth's natural magnetic field. These distortions lead to inaccurate readings, posing navigation and land surveying challenges.Local...
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Remote Magnetic Navigation for Accurate, Real-time Catheter Positioning and Ablation in Cardiac Electrophysiology Procedures
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复杂的环境地磁匹配辅助导航算法基于改进的极端机器学习.

Jian Huang1, Zhe Hu1, Wenjun Yi1

  • 1National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, China.

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概括
此摘要是机器生成的。

这项研究引入了一种新的地磁匹配导航算法,用于空中飞行器,提高定位准确度和在具有挑战性的环境中的稳定性. 拟议的方法显著优于现有模型,可实现实时,精确的位置跟踪.

关键词:
极端学习的机器学习.北方戈斯霍克优化算法地磁匹配辅助导航辅助导航磁传感器是一种磁传感器.

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科学领域:

  • 航空航天工程 航空航天工程
  • 地质物理学 地质物理学
  • 人工智能的人工智能

背景情况:

  • 高速飞行器的精确定位在卫星信号干扰的环境中具有挑战性.
  • 在这种情况下,惯性导航系统本身不足以准确导航.

研究的目的:

  • 提出和验证一个以北戈肖克优化 (NGO) 算法增强的极端学习机器 (ELM),用于地磁匹配辅助的空中飞行器导航.
  • 改进非政府组织算法,以提高匹配性能和稳定性.

主要方法:

  • 使用北Goshawk优化 (NGO) 算法优化极端学习机器 (ELM) 的初始权重和偏差.
  • 实施了NGO算法的三个改进,并通过CEC2005基准功能套件进行了验证.
  • 使用IGRF-13模型生成地磁匹配数据集,用于对五种模型 (INGO-ELM,NGO-ELM,ELM,INGO-XGBoost,INGO-BP) 的比较分析.

主要成果:

  • 拟议的INGO-ELM模型实现了实时定位 (0.27微秒),平均绝对误差约为6.38米 (度),6.43米 (经度) 和0.0137米 (高度).
  • 与其他四种测试模型相比,INGO-ELM模型表现出优越的性能.
  • 该模型表现出了出色的稳定性,即使在测试组输入中引入噪声时,也保持了相同数量级的定位准确性.

结论:

  • 地磁匹配辅助导航算法可以实时,准确和稳定的定位空中飞行器.
  • 该算法即使在磁传感器的观测错误的情况下也可靠地执行.
  • 加强的NGO-ELM方法在空中导航技术方面取得了重大进展.