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相关概念视频

Errors in Global Positioning System01:26

Errors in Global Positioning System

49
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,...
49
Field Application of Global Positioning System01:28

Field Application of Global Positioning System

51
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...
51
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

63
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...
63
Introduction to Global Positioning System01:30

Introduction to Global Positioning System

67
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,...
67
Common Leveling Mistakes and Errors01:17

Common Leveling Mistakes and Errors

78
A survey team is tasked with determining the elevation difference between points Point A and Point B, separated by uneven terrain. They use a leveling instrument and a leveling rod.Common MistakesMisreading the Rod: During a backsight reading at Point A, the instrumentman observes the rod partially obscured by tall grass. Instead of reading 1.135 m, they mistakenly record 1.735 m due to the misalignment of the crosshair with the wrong graduation. This error adds 0.600 m to all subsequent...
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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

56
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...
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相关实验视频

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改进了GNSS模糊性快速估计减少算法

Xinzhong Li1, Yongliang Xiong1, Weiwei Chen2

  • 1Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China.

Sensors (Basel, Switzerland)
|October 28, 2023
PubMed
概括
此摘要是机器生成的。

这项研究增强了LLL算法,通过减少格子基础减少时间,更快地实现全球导航卫星系统 (GNSS) 的高精度定位. 改进的方法大大减少了计算,使得模两可的解决方案更快.

关键词:
在GNSS中使用GNSS.减少了LLL的减少.整数模两可的情况整数最小平方的整数.部分缩小尺寸的部分缩小尺寸.

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科学领域:

  • 地理学工程 工程地质学
  • 卫星导航系统 卫星导航系统
  • 计算数学 计算数学 计算数学

背景情况:

  • 全球导航卫星系统 (GNSS) 的高精度定位依赖于快速准确的整数模两可的分辨率.
  • 高维模糊性解决的格子理论表明,格子基础的减少是一个重要的瓶,比搜索耗费更多的时间.
  • 提高格子基减小算法的效率对于推进GNSS定位至关重要.

研究的目的:

  • 为了提高最小正方形与整数运算 (LLL) 算法的效率,以减少格子基础.
  • 为了减少在GNSS中解决高维整数模糊性的时间消耗和计算复杂性.
  • 在降低效率和稳定性方面评估改进的LLL算法的性能.

主要方法:

  • 使用了户主QR分解,最小的列旋转到预排序基向量.
  • 实施了部分缩小尺寸和放松的基础向量交换条件,以提高LLL算法的效率.
  • 使用模拟和测量GNSS数据验证了改进的算法.

主要成果:

  • 改进的LLL算法显著减少了基向量交换的数量和总体减少的时间.
  • 像HSLLL和PSLLL这样的算法在使用西格尔条件时显示出更好的减少效果,但稳定性略低.
  • PLLLR算法在搜索模糊性解决效率方面取得了显著的改进.

结论:

  • 增强的LLL算法有效地降低了GNSS的晶格基础减少中的计算开销.
  • 修改过的算法在减少效应,稳定性和在模糊性解决中的效率之间提供了权衡.
  • 开发的方法有助于在GNSS应用中快速准确实现整数模两可的解决方案.