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相关概念视频

Introduction to Global Positioning System01:30

Introduction to Global Positioning System

61
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,...
61
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
Field Application of Global Positioning System01:28

Field Application of Global Positioning System

46
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...
46
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

58
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...
58
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

35
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...
35
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

37
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 short...
37

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相关实验视频

Updated: Jul 5, 2025

Trajectory Data Analyses for Pedestrian Space-time Activity Study
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一个精确而稳定的基于空间的时间系统,用于智能城市的导航.

Shaoqian Li1,2,3,4, Baojun Lin1,2,3,4,5, Rui Li2,3,4

  • 1Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 101408, China.

Sensors (Basel, Switzerland)
|January 23, 2024
PubMed
概括
此摘要是机器生成的。

一个新的基于太空的时间系统增强了智能城市的卫星导航. 这种精确的系统可以提高计时的准确性和稳定性,这对于可靠的定位服务至关重要.

关键词:
卫星间连接是卫星之间的连接.卫星导航系统 卫星导航系统智慧城市是智慧城市.基于空间的时间系统.

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相关实验视频

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科学领域:

  • * 卫星导航系统 卫星导航系统
  • * 智慧城市应用程序
  • * 具有高精度计时功能.

背景情况:

  • *高精度和高稳定的基于空间的时间系统对于智能城市卫星导航的服务质量 (QoS) 是必不可少的.
  • *当前的系统需要精确的时间参考,以便可靠的导航和定位.

研究的目的:

  • * 提出一个使用自主时间尺度的精确和高稳定的基于空间的时间系统.
  • *研究生成,维护和传输高精度的基于空间的时间参考.
  • * 改进卫星时钟偏移建模和预测,用于增强导航服务.

主要方法:

  • * 开发使用ALGOS算法进行跨卫星链路双向时间比较的集中时间比较方法.
  • *与参考相比,对卫星的时差,速度和漂移参数的同时估计.
  • *使用一段时间内所有卫星链路的相对时差观测.

主要成果:

  • * 在自主时间尺度参考下,证明了拟议的基于空间的时间系统的高精度和稳定性.
  • * 与直接观测方法相比,实现了显著更高的时钟偏移监测弧覆盖率.
  • *使用北斗导航系统的现实数据验证了系统的效率.

结论:

  • * 拟议的基于空间的时间系统有效地满足了智能城市导航中高精度和高稳定度计时的要求.
  • * 该系统提供了卓越的时钟偏移监控功能,提高了卫星导航的可靠性.
  • * 这项研究为先进的卫星时钟偏移建模和预测提供了强大的框架.