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相关概念视频

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

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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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Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

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

Introduction to Global Positioning System

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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,...
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Errors in Global Positioning System01:26

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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,...
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Adjusting a Traverse01:12

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In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
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参考复合特征数据库构建方法基于轨道细分,用于重力匹配辅助导航.

Menghan Xi1, Lin Wu2, Qianqian Li2

  • 1State Key Laboratory of Precision Geodesy, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, China; University of Chinese Academy of Sciences, Beijing 100049, China; Chongqing Vocational Institute of Engineering, Chongqing 402260, China.

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|February 5, 2025
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概括

一种用于重力匹配辅助导航的新方法使用复合特征数据库 (TS-RFD) 来提高定位精度和稳定性. 这种方法提高了导航系统相比传统的方法只使用重力异常值.

关键词:
重力匹配辅助导航辅助导航测量数据实验的测量数据参考复合特征数据库的数据库特征.质地特征 质地特征轨道细分 搜索策略 轨道细分 搜索策略

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科学领域:

  • 地质物理学 地质物理学
  • 导航系统 导航系统
  • 数据科学数据科学数据科学

背景情况:

  • 重力匹配辅助导航在很大程度上依赖于参考数据库来准确定位.
  • 传统的数据库通常只使用重力异常值,限制性能.
  • 匹配算法设计与数据库结构和内容密切相关.

研究的目的:

  • 提出一种基于轨道细分 (TS-RFD) 的新型参考复合特征数据库构建方法.
  • 为了提高重力匹配辅助导航系统的效率,准确性和稳定性.
  • 通过传统数据库验证TS-RFD方法的性能.

主要方法:

  • 从重力参考数据中提取纹理特征.
  • 建立参考复合特征数据库,使用8种特征 (例如索引和匹配特征).
  • 实施轨道细分搜索策略,使用关键-值对进行匹配.

主要成果:

  • 与传统的数字数据库相比,TS-RFD方法显著提高了匹配的准确性和稳定性.
  • 在南中国海进行的模拟实验显示,精度和稳定性明显提高.
  • 现实世界的数据测试表明,TS-RFD的平均定位精度为1.19海里,而传统方法的1.45海里.

结论:

  • TS-RFD方法为构建用于导航的重力参考数据库提供了一种优越的方法.
  • 由重力分布和变化产生的复合特征提高了导航系统的性能.
  • 拟议的方法提供了强大的稳定性和更高的定位成功率.