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相关概念视频

Circular Orbits and Critical Velocity for Satellites01:16

Circular Orbits and Critical Velocity for Satellites

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The Moon orbits around the Earth. In turn, the Earth (and other planets) orbit the Sun. The space directly above our atmosphere is filled with artificial satellites in orbit. One can examine the circular orbit, the simplest kind of orbit, to understand the relationship between the speed and the period of planets and satellites with respect to their positions and the bodies that they orbit.
Nicolaus Copernicus (1473-1543) first suggested that the Earth and all other planets orbit the Sun in...
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Energy of a Satellite in a Circular Orbit

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Thousands of artificial satellites orbit the Earth every day at various distances from the Earth. Satellites that orbit the Earth below an altitude of 1,600 km are considered to be orbiting in low-Earth orbit (LEO). Research satellites and Earth observation satellites are usually placed in LEO, and mostly orbit the Earth in elliptical orbits. Navigation satellites are placed in medium-Earth orbit (MEO), ranging from 2,000 km to 36,000 km from the surface of the Earth. Meanwhile, communication...
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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
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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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Errors in Global Positioning System01:26

Errors in Global Positioning System

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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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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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相关实验视频

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Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
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对于Mega-LEO卫星星座的层次资源管理

Liang Gou1, Dongming Bian1, Yulei Nie2

  • 1School of Communications and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003, China.

Sensors (Basel, Switzerland)
|February 13, 2025
PubMed
概括

超低地球轨道 (LEO) 卫星星座可以改善卫星互联网和6G. 一个新的三层架构增强了大型LEO卫星星座系统 (MLSCS) 的资源分配和调度,以提高效率.

关键词:
资源管理层次的资源管理.避免干扰 避免干扰巨大的LEO卫星星座系统.服务区规划服务区规划频谱认知 频谱认知

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科学领域:

  • 卫星通信 卫星通信
  • 网络工程 网络工程
  • 无线网络 无线网络 无线网络

背景情况:

  • 超低地球轨道 (LEO) 卫星星座对于未来的卫星互联网和6G网络至关重要.
  • 有效的资源分配和调度是大型LEO卫星星座系统 (MLSCS) 的重大挑战.
  • 热点地区的集中用户需求需要有效的资源管理.

研究的目的:

  • 为MLSCS资源管理提出一种新的三层管理架构.
  • 提高资源利用效率,特别是在用户需求热点地区.
  • 提供可适应动态网络条件的实时调度功能.

主要方法:

  • 一个三层管理架构:网络控制中心 (NCC),空间基地站 (SBS) 和用户终端 (UT).
  • 探索资源调度策略:频谱认知,干扰协调,光束调度,多卫星协作和随机访问.
  • 基于模拟的建议方法和算法的评估.

主要成果:

  • 拟议的三层架构有效地管理了MLSCS.中的资源.
  • 调度策略和算法显示了资源管理的显著改进.
  • 该架构减轻了陆地NCC的处理负担.

结论:

  • 新的三层架构在MLSCS中对资源管理是有效的.
  • 拟议的调度策略提高了资源利用率和适应能力.
  • 这项工作有助于推进卫星互联网和6G网络基础设施.