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相关概念视频

Errors in Global Positioning System01:26

Errors in Global Positioning System

71
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,...
71
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

82
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...
82
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

81
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...
81
Field Application of Global Positioning System01:28

Field Application of Global Positioning System

69
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...
69

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相关实验视频

Updated: Jul 23, 2025

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements
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在VANET中使用基于权重的PA-GPSR协议改进方法.

Wenzhu Zhang1, Leilei Jiang1, Xi Song1

  • 1School of Information and Control Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.

Sensors (Basel, Switzerland)
|July 14, 2023
PubMed
概括

一个新的基于权重的Path-Aware Greedy Perimeter无国籍路由协议 (W-PAGPSR) 增强了车辆临时网络 (VANET). 该协议可以在稀疏的城市环境中提高路由稳定性和数据传输效率.

科学领域:

  • 智能运输系统 智能运输系统
  • 无线通信网络 无线通信网络
  • 网络路由协议 网络路由协议

背景情况:

  • 车辆特设网络 (VANET) 对智能交通系统至关重要,但因节点移动性和密度变化,路由效率受到挑战.
  • 像GPSR和PA-GPSR这样的现有协议在稀疏的城市VANET中扎着局部最佳性和路由循环.

研究的目的:

  • 提出一个基于权重的Path-Aware Greedy Perimeter无国籍路由协议 (W-PAGPSR),以解决VANET中现有的路由协议的局限性.
  • 在稀疏的城市VANET环境中提高路由稳定性和数据传输效率.

主要方法:

  • W-PAGPSR协议分为两个阶段运行:路由建立和路由维护.
  • 路由建立使用节点距离,密度,通信持续时间和移动方向,通过重量贪策略可靠选择下一个跳跃.
  • 路由维护使用数据包交付角度和可靠的节点密度来选择下一个跳跃,使用重量周边策略来实现路由修复.

主要成果:

  • 与GPSR,MM-GPSR和PA-GPSR相比,W-PAGPSR显示出显著的性能改善.
  • 包丢失率的平均减少分别为24.47%,25.02%和14.12%.
  • 平均端到端延迟减少了48.34%,79.96%和21.45%,而网络吞吐量分别增加了47.68%,58.39%和20.33%.
关键词:
瓦内特 (Vanet) 是一个名字.贪的战略 贪的战略意识到路径,意识到路径.周边战略 周边战略路由协议 路由协议 路由协议

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Last Updated: Jul 23, 2025

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结论:

  • 拟议的W-PAGPSR协议有效地提高了VANET中的网络吞吐量.
  • W-PAGPSR成功地减少了端到端的平均延迟和数据包丢失率,在稀疏的城市条件下表现优于现有的协议.