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相关概念视频

Field Application of Global Positioning System01:28

Field Application of Global Positioning System

41
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...
41
Introduction to Global Positioning System01:30

Introduction to Global Positioning System

53
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,...
53
Errors in Global Positioning System01:26

Errors in Global Positioning System

41
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,...
41
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

27
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...
27
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

54
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...
54

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生物启发的机器学习辅助基于地磁场的AUV导航系统.

Ananda Ramadass Gidugu1, Bala Naga Jyothi Vandavasi2, Vedachalam Narayanaswamy1

  • 1Ministry of Earth Sciences, National Institute of Ocean Technology, Chennai, India.

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概括

海洋动物激发了自主水下车辆 (AUV) 的新航行方式. 使用地球的地磁场 (GMF) 和机器学习,AUV可以在没有声系统的情况下确定其位置,实现高精度.

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生物启发的生物灵感.地磁场是一个地磁场.长距离的远程飞机机器学习 机器学习一个磁力计的磁力计.导航 导航 导航 导航 导航定位定位 定位定位 定位定位

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科学领域:

  • 机器人和导航 机器人和导航
  • 地质物理学 地质物理学
  • 机器学习 机器学习

背景情况:

  • 动物的导航激发了新技术.
  • 自主水下车辆 (AUV) 需要精确的定位.
  • 地磁场 (GMF) 提供了一个潜在的导航源.

研究的目的:

  • 探索基于GMF的自动驾驶汽车导航.
  • 在没有声学系统的情况下实现绝对定位.
  • 评估机器学习在GMF导航中的作用.

主要方法:

  • 应用监督机器学习算法 (随机森林,决策树) 到GMF强度数据.
  • 利用NOAA世界磁力模型在印度洋中部的900平方公里面积.
  • 考虑的磁力计具有0.1 nT的数据采集灵敏度.

主要成果:

  • 在AUV的2D平面中实现了绝对平均位置精度.
  • 53米和56米的证明圆形误差可能 (CEP 50).
  • 验证了GMF异常导航作为可行的GPS替代方案.

结论:

  • 标尺GMF异常导航是AUV可行的GPS替代方案.
  • 这种方法可以在没有传统声学系统的情况下实现自主导航.
  • 该系统可以使用倾斜和偏斜向量扩展到更大的区域.