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相关概念视频

Field Application of Global Positioning System01:28

Field Application of Global Positioning System

30
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...
30
GIS Software, Hardware, and Sources of GIS Data01:23

GIS Software, Hardware, and Sources of GIS Data

41
A Geographic Information System (GIS) combines specialized software and hardware to effectively manage, analyze, and present spatial and related data. GIS software includes critical functionalities such as a user interface for easy navigation, database management tools for handling spatial and attribute data, and data retrieval features for efficient access. Analytical tools transform raw data into insights, while display functions produce maps and reports in various formats for effective...
41
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

49
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...
49
Selected Data About Geographic Locations01:25

Selected Data About Geographic Locations

26
Geographic Information Systems (GIS) rely on two core types of data: spatial data and attribute data.Spatial DataSpatial data defines the physical location of features within a coordinate system, typically expressed in terms of latitude and longitude. It provides precise positioning for elements like roads, rivers, or buildings.Attribute DataAttribute data complements spatial data by adding descriptive information about these features. For example, a road's spatial data includes its start and...
26
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

22
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...
22
Errors in Global Positioning System01:26

Errors in Global Positioning System

36
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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相关实验视频

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Detecting Pre-Stimulus Source-Level Effects on Object Perception with Magnetoencephalography
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基于信息几何原理的环境和统计学上稳健的匹配场源本地化.

Jingwei Yin1,2, Xuan Zhou1,2, Ran Cao1,3

  • 1Key Laboratory for Polar Acoustics and Application of Ministry of Education (Harbin Engineering University), Ministry of Education, Harbin, 150001, China.

The Journal of the Acoustical Society of America
|December 10, 2024
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概括
此摘要是机器生成的。

本研究介绍了一种强大的匹配场处理 (MFP) 方法,使用信息几何学来改善水下源的定位. 与传统技术相比,新方法提高了准确性并减少了干扰.

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科学领域:

  • 海洋声学 海洋声学
  • 信号处理 信号处理
  • 地质物理学 地质物理学

背景情况:

  • 匹配场处理 (MFP) 使用阵列和复制信号定位水下源.
  • 传统的MFP依赖于跨光谱密度矩阵 (CSDM) 之间的欧几里德距离,但对环境和统计不匹配很敏感.
  • 现有的方法,如带有环境扰乱约束的最小方差MFP,提供有限的稳定性.

研究的目的:

  • 开发一个强大的MFP用于水下来源定位.
  • 提高对环境和统计数据不匹配的稳定性.
  • 改进源本地化分辨率并降低侧叶水平.

主要方法:

  • 使用信息几何学来建模CS DMs作为Riemannian多元体上的点.
  • 使用地理距离量化CSDM相似性.
  • 引入一个受约束的复制品CSDM,并使用里曼尼和修改的詹森-香农距离用于一个新的MFP.
  • 开发基于非欧几里德距离的强大的匹配场处理器.

主要成果:

  • 与传统的MFP相比,拟议的处理器在环境和统计不匹配方面表现出更高的稳定性.
  • 模拟和实验结果证实了性能的提高.
  • 侧叶水平降低,分辨率提高.

结论:

  • 可以使用信息几何学和非欧几里德距离来提升MFP.
  • 拟议的强大的MFP为水下来源定位提供了显著的改进.
  • 这种方法为复杂的海洋环境中声信号处理提供了更可靠的方法.