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相关概念视频

Errors in Global Positioning System01:26

Errors in Global Positioning System

32
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,...
32
Field Application of Global Positioning System01:28

Field Application of Global Positioning System

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The Global Positioning System (GPS) has become an indispensable tool in fieldwork, offering unparalleled precision and efficiency for surveying, navigation, and infrastructure development. By harnessing signals from a constellation of satellites, GPS receivers determine the location of objects with remarkable speed and accuracy, often completing calculations within a second.Advantages of Modern GPS TechnologyContemporary GPS receivers are designed to meet the practical demands of field...
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Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

47
GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
47
Introduction to Global Positioning System01:30

Introduction to Global Positioning System

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The Global Positioning System (GPS) revolutionized positioning on Earth, providing precise location data through satellite ranging. The GPS system was developed in 1978 by the U.S. Department of Defense  for military use, and it became available for civilian applications in 1983, transforming fields including navigation, fleet management, and time synchronization for telecommunications systems.GPS consists of satellites in medium Earth orbit, about 20,200 kilometers above the surface,...
45
Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device01:30

Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device

19
Surveyors use Global Positioning System (GPS) technology to measure the precise location and elevation of points on Earth. In a recent survey, GPS receivers were used to determine the coordinates and elevations of two park monuments. The process involved careful mission planning, data collection, and correction to ensure accuracy. The survey began with mission planning to identify optimal satellite visibility and minimize Position Dilution of Precision (PDOP). A geodetic control point...
19
Mechanistic Models: Compartment Models in Algorithms for Numerical Problem Solving01:29

Mechanistic Models: Compartment Models in Algorithms for Numerical Problem Solving

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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.
In individual population analyses, different algorithms are employed, such as Cauchy's method, which uses a...
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相关实验视频

Updated: May 28, 2025

Dynamic Navigation in Endodontics: Guided Access Cavity Preparation by Means of a Miniaturized Navigation System
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动态建模及其对GPS导航过器估计准确性的影响

Dah-Jing Jwo1, Ta-Shun Cho2, Birhanu Ayalew Demssie1

  • 1Department of Communications, Navigation and Control Engineering, National Taiwan Ocean University, 2 Peining Road, Zhongzheng, Keelung 202301, Taiwan.

Sensors (Basel, Switzerland)
|February 13, 2025
PubMed
概括
此摘要是机器生成的。

这项研究通过在扩展的卡尔曼波器 (EKF) 中使用虚拟过程噪声来增强GPS导航,以克服动态建模的不准确性. 这种方法可以在各种运动场景中提高轨迹跟踪和导航精度.

关键词:
差异的分歧差异的分歧.扩展的卡尔曼过器全球定位系统全球定位系统建模 建模模型 建模模型

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科学领域:

  • 导航系统 导航系统
  • 估计理论估计理论
  • 信号处理 信号处理

背景情况:

  • 卡尔曼波器 (KF) 和扩展的卡尔曼波器 (EKF) 算法依赖于过程模型,这些过程模型往往与现实环境不同,降低了实时导航性能.
  • 动态建模中的不准确性是全球定位系统 (GPS) 导航中分歧问题的主要原因.

研究的目的:

  • 解决GPS导航系统中因动态建模不准确而导致的分歧问题.
  • 引入和评估虚构的工艺噪声作为缓解EKF分歧的解决方案.
  • 为了提高GPS导航过器的可观测性和可控制性.

主要方法:

  • 该研究采用扩展卡尔曼波器 (EKF),引入虚构的工艺噪声.
  • 协差估计和调整因子被用来提高过器的性能.
  • 模拟包括各种运动场景:静止接收器,直线轨迹 (恒定/变速) 和转向轨迹.
  • 位置 (P),位置-速度 (PV) 和位置-速度-加速 (PVA) 模型使用模拟接收器进行评估.

主要成果:

  • 包括工艺噪声使EKF能够适应速度和方向的变化,而无需明确的动态建模.
  • 与普通最小方形 (OLS) 方法相比,模拟显示了改进的车辆轨迹跟踪.
  • 带有虚构过程噪声的EKF在各种场景中显示了增强的统计可靠性和现实世界的性能.

结论:

  • 虚构的工艺噪声是缓解基于EKF的GPS导航系统差异的有效补救措施.
  • 拟议的方法提供了一种系统方法来提高估计准确性,并扩大导航系统的适用性.
  • 这项研究为提高GPS导航过器设计的稳定性和精度提供了宝贵的见解.