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相关概念视频

Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

307
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...
307
Field Application of Global Positioning System01:28

Field Application of Global Positioning System

283
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...
283
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

357
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...
357
Errors in Global Positioning System01:26

Errors in Global Positioning System

304
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,...
304
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

434
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...
434
Introduction to Global Positioning System01:30

Introduction to Global Positioning System

424
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,...
424

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相关实验视频

Updated: Jan 7, 2026

Microfluidic Platform with Multiplexed Electronic Detection for Spatial Tracking of Particles
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一个两阶段的框架,用于传感器选择和地理定位,用于eVTOL紧急定位,使用高频天空波.

Xijun Liu1, Houlong Ai1, Chen Xu1

  • 1College of Aviation Electronic and Electrical Engineering, Civil Aviation Flight University of China, Chengdu 641400, China.

Sensors (Basel, Switzerland)
|December 31, 2025
PubMed
概括

本研究引入了高频 (HF) 地理定位的两阶段框架,以寻找失踪的电动垂直起降 (eVTOL) 飞机. 该方法通过在地理位置之前选择接收器来改善紧急搜索和救援,提高准确性.

关键词:
在 eVTOL 紧急地理位置.高频 (HF) 高频 (HF) 高频 (HF) 是一个非视线 (NLOS) 的非视线随机空间频谱 (RSS) 是一个随机空间频谱.接收器的选择接收器的选择

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科学领域:

  • 航空航天工程 航空航天工程
  • 信号处理 信号处理
  • 地质物理学 地质物理学

背景情况:

  • 高频 (HF) 地理定位对于定位失踪飞机和支持紧急行动至关重要.
  • 电动垂直起降 (eVTOL) 飞机可能会出现通信损失,需要强大的地理定位方法.
  • 现有的地理定位技术可能对噪音和非视线 (NLOS) 条件敏感.

研究的目的:

  • 为基于高频空波传播的eVTOL飞机提供一个新的两阶段框架.
  • 提高地理位置的可靠性和准确性,特别是在通信中断或NLOS的场景中.
  • 为紧急 eVTOL 恢复操作提供方法论基础.

主要方法:

  • 一个两阶段的方法:A阶段涉及接收器选择 (有和没有偏差先验),而B阶段采用随机空间频谱 (RSS) 地理定位.
  • 阶段A使用几何可观测性和非视线 (NLOS) 偏差先验,并对接收器选择进行了强有力的加权.
  • 阶段B使用基于RSS的地理位置的网格目标函数匹配,减轻对时间差估计错误的敏感性.

主要成果:

  • 拟议的"先选择,然后地理定位"框架在与直接地理定位方法相比,显示出更高的性能.
  • 模拟和现实世界的测量验证了两阶段方法的有效性.
  • 该方法在NLOS条件下保持稳定性,改善地理位置可用性.

结论:

  • 开发的基于HF天空波的地理定位框架为紧急 eVTOL搜索和救援提供了显著的改进.
  • 两阶段的接收器选择和RSS地理位置策略提高了准确性和可靠性.
  • 这项研究为在关键航空场景中的实际应用提供了基础证据.