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相关概念视频

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
Field Application of Global Positioning System01:28

Field Application of Global Positioning System

25
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...
25
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
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

25
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 short...
25
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

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相关实验视频

Updated: May 28, 2025

Picometer-Precision Atomic Position Tracking through Electron Microscopy
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用于定期检查的高精度绘图和定位技术.

Xianghua Fan1, Wenbo Pan2

  • 1Changsha University, 98 Hongshan Road, Changsha, 410022, China.

Scientific reports
|February 9, 2025
PubMed
概括
此摘要是机器生成的。

本研究提出了一个新的框架,用于在没有全球导航卫星系统 (GNSS) 信号的道中精确地绘制移动地图. 该方法精确追踪轨迹,使得可靠的道缺陷监测和进展趋势的评估.

关键词:
地图建设地图建设.多限制框架 多限制框架定期进行检查.定位定位 定位定位 定位定位

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科学领域:

  • 机器人技术和自主系统
  • 地理学工程 工程地质学
  • 土木工程 土木工程是指土木工程.

背景情况:

  • 由于缺乏全球导航卫星系统 (GNSS) 数据,移动地图系统在道中扎着累积错误,阻碍了精确的定位和地图复制.
  • 这种局限性阻碍了精确的道缺陷检测和随时间的缺陷进展的评估,这对于基础设施维护至关重要.
  • 现有的多传感器融合方法往往容易导致传感器退化,导致在具有挑战性的环境中轨迹估计失败.

研究的目的:

  • 开发一个强大的框架,用于精确的移动地图和轨道估计在道内,克服GNSS信号缺失.
  • 通过实现精确,可重复的点云映射和缺陷分析,提高道检查的可靠性.
  • 通过精确的定位,为长期道监测和缺陷进展评估提供解决方案.

主要方法:

  • 一个高维,多约束框架,集成前端错误状态卡尔曼波器 (ESKF) 测距和后端因子图优化.
  • 实施百米标记器检测和识别,用于强大的循环关闭检测和精确的初始定位.
  • 通过在现实世界地铁道场景中进行广泛的实验来验证.

主要成果:

  • 拟议的方法在长道场景中证明了可靠的轨迹估计,优于传统的多传感器聚变技术.
  • 在道环境中实现了显著的地图轨迹一致性,累积误差低于0.02%.
  • 展示了高精度和可靠性,平均定位误差仅为0.05米.

结论:

  • 开发的框架有效地消除了累积的错误,并且在没有GNSS的情况下提供了精确的列车定位,这对于道绘图至关重要.
  • 该方法比传统方法具有显著的优势,特别是在传感器退化的场景中.
  • 该方法在地铁道中成功验证,为基础设施检查和维护应用提供了有希望的前景.