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相关概念视频

Field Application of Global Positioning System01:28

Field Application of Global Positioning System

49
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...
49
Errors in Global Positioning System01:26

Errors in Global Positioning System

46
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,...
46
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

37
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...
37
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

62
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...
62
Introduction to Global Positioning System01:30

Introduction to Global Positioning System

63
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,...
63
Methods of Obtaining Topography01:25

Methods of Obtaining Topography

68
Topography involves measuring and mapping land elevations, natural features, and artificial structures to create accurate representations of the terrain. Topographic surveying relies on traditional and modern methods, each with distinct advantages and limitations.Traditional Surveying Methods:Transit stadia surveys and plane table surveys were widely used traditional surveying methods. These techniques relied on instruments like theodolites and stadia rods for measuring distances and angles,...
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相关实验视频

Updated: Jul 9, 2025

Using a Real-Time Locating System to Measure Walking Activity Associated with Wandering Behaviors Among Institutionalized Older Adults
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在复杂环境中稀疏分布的边缘计算设备中使用蓝牙技术进行室内定位的图形三边化.

Yashar Kiarashi1, Soheil Saghafi1, Barun Das1

  • 1Department of Biomedical Informatics, School of Medicine, Emory University, Atlanta, GA 30322, USA.

Sensors (Basel, Switzerland)
|December 9, 2023
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概括
此摘要是机器生成的。

这项研究介绍了一种低成本的边缘计算系统,使用蓝牙低能 (BLE) 信号来跟踪轻度认知障碍 (MCI) 患者的室内活动. 该系统准确评估空间导航,有助于监测认知健康和治疗反应.

关键词:
蓝牙是低能耗的蓝牙.环境健康监测环境健康监测云计算是云计算中的一个.边缘计算是一种边缘计算.室内局部化 室内局部化

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科学领域:

  • 生物医学工程 生物医学工程
  • 计算机科学 计算机科学
  • 认知科学 认知科学

背景情况:

  • 空间导航模式为认知健康提供了洞察力.
  • 轻度认知障碍 (MCI) 影响空间能力.
  • 现有的室内跟踪方法在复杂的环境中可能缺乏可扩展性或准确性.

研究的目的:

  • 开发和评估一个低成本,可扩展,开源的边缘计算系统来跟踪室内运动.
  • 通过空间导航分析评估患有MCI的参与者的认知健康和治疗反应.
  • 为了克服由于传感器分布稀疏的室内定位方面的挑战.

主要方法:

  • 在一个1700平方米的设施中,采用39个蓝牙低能耗 (BLE) 信标和雾服务器实现了一个边缘计算系统.
  • 开发一个图形三边化方法,考虑时间信标命中密度,以解决稀疏的边缘设备覆盖范围.
  • 参与者携带的边缘计算系统对BLE信号接收的分析.

主要成果:

  • 在多个参与者中实现了4.4米的平均定位误差.
  • 在整个研究区域的区域级定位中达到超过85%的准确性.
  • 在临床环境中证明了系统的有效性,信号强度变化和间歇性信标检测.

结论:

  • 一个普通的医疗设施可以转变为一个智能空间,用于自动运动评估.
  • 开发的系统可以客观地监测空间导航,这可能反映了MCI患者的健康状况或治疗疗效.
  • 图形三边化方法提供了一个强大的解决方案,用于室内定位在稀有仪器的环境.