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相关概念视频

Errors in Global Positioning System01:26

Errors in Global Positioning System

313
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,...
313
Field Application of Global Positioning System01:28

Field Application of Global Positioning System

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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...
293
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

372
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...
372
Introduction to Global Positioning System01:30

Introduction to Global Positioning System

442
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,...
442
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

321
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...
321
Reducing Line Loss01:18

Reducing Line Loss

349
In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...
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通过 minmax 优化增强 BeiDou/GNSS 的完整性.

Jingsong Qiu1,2, Ci Chen1,3, Siyu Lei1,4

  • 1School of Automation, Guangdong University of Technology, Guangzhou 510006, China.

PNAS nexus
|December 1, 2025
PubMed
概括
此摘要是机器生成的。

本研究介绍了Optimal-ARAIM,这是一项用于 BeiDou/GNSS 导航的新完整性监控策略. 它显著降低了垂直保护水平 (VPL),提高了航行安全和可靠性.

关键词:
这里是ARAIM ARAIM.在GNSS中使用GNSS.最大的监控订单最高监控订单最小至最大的优化优化垂直保护水平 垂直保护水平

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科学领域:

  • 卫星导航系统 卫星导航系统
  • 导航完整性监控 导航完整性监控
  • 航空航天工程 航空航天工程

背景情况:

  • 诚信对于导航系统的可用性至关重要,影响运输,安全和监控.
  • 现有的完整性监测策略面临的挑战是 BeiDou / 全球导航卫星系统 (GNSS) 中复杂的故障场景.

研究的目的:

  • 提出和评估一个新的完整性监控策略,Optimal-ARAIM,以优化北斗/GNSS的垂直保护水平 (VPL).
  • 通过改进完整性监控,提高航行操作的稳定性和可靠性.

主要方法:

  • 通过调整全套解决方案并分配完整性/连续性风险,Optimal-ARAIM使用最小值估计器来最大限度地减少VPL.
  • 一个最大监控顺序机制减轻了来自卫星故障的组合式爆炸,将场景制定为凸起的优化问题.
  • 使用 BeiDou 观测和日历数据,以及全球 GNSS 日历数据来评估性能.

主要成果:

  • 在使用观察数据的五个亚洲站中,平均VPL始终低于8米.
  • 使用BeiDou年鉴数据预测的VPL分布主要在10米以下.
  • 全球可用性覆盖率超过93%,符合CAT-I标准.

结论:

  • 最佳-ARAIM有效地减少了BeiDou/GNSS的VPL,确保了稳健可靠的导航.
  • 拟议的战略提高了运输和监视等关键应用的航行安全.
  • 该方法表明全球可用性很高,符合严格的国际标准.