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相关概念视频

Errors in Global Positioning System01:26

Errors in Global Positioning System

323
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,...
323
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

339
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...
339
Local Attraction01:22

Local Attraction

349
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...
349
Field Application of Global Positioning System01:28

Field Application of Global Positioning System

308
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...
308
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

377
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...
377

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相关实验视频

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Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements
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一个语义关联因子图模型用于LiDAR辅助的室内多路径定位.

Bingxun Liu1, Ke Han1, Zhongliang Deng1

  • 1School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China.

Sensors (Basel, Switzerland)
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概括

这项研究引入了一种LiDAR辅助的方法,用于精确的室内定位,提高了32.1%的精度. 它有效地使用环境数据来纠正来自无线信号反射的错误,提高复杂空间的稳定性.

关键词:
李达尔 (LiDAR) 是一种激光雷达.因子图的优化优化因素图的优化室内位置 室内位置多路径的多路径.虚拟可以成为虚拟.

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科学领域:

  • 机器人技术和自主系统
  • 无线通信和信号处理
  • 地理学工程 工程地质学

背景情况:

  • 全球导航卫星系统 (GNSS) 在室内无法使用.
  • 像5G和超宽带 (UWB) 这样的无线信号用于室内定位.
  • 复杂的室内结构的多路径效应会降低定位精度.

研究的目的:

  • 开发一种LiDAR辅助的方法,用于多路径误差估计和高精度室内定位.
  • 整合环境语义信息,以改善多路径校正.
  • 为了提高复杂的室内环境中的定位稳定性.

主要方法:

  • 使用LiDAR和无线信号的紧密结合的感知定位框架.
  • 一个基于语义特征的神经网络,用于从LiDAR点云中检测反射表面.
  • 一个统一的因子图模型,用于联合推断状态和反射器信息.

主要成果:

  • 使用LiDAR精确提取反射器的几何参数.
  • 动态区分和利用视线 (LOS) 和非视线 (NLOS) 路径.
  • 与传统方法相比,根平均平方误差 (RMSE) 提高了32.1%.

结论:

  • 拟议的方法有效地解决了复杂的室内环境中的多路径效应.
  • 激光雷达辅助的语义信息显著提高了室内定位的准确性和稳定性.
  • 为高精度定位在具有挑战性的室内环境中提供了可行的解决方案.