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相关概念视频

IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

949
IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
949
Field Application of Global Positioning System01:28

Field Application of Global Positioning System

69
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...
69
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

82
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...
82

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相关实验视频

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频道状态信息基于室内指纹定位

Rongjie Che1, Honglong Chen2

  • 1Sinopec Petroleum Engineering Corporation, Dongying 257026, China.

Sensors (Basel, Switzerland)
|July 14, 2023
PubMed
概括

本研究介绍了两种基于WiFi的室内定位方法,AmpFi和FuFi,使用通道状态信息 (CSI) 精确定位在像道这样的狭窄空间. 与现有技术相比,FuFi表现出优越的性能.

科学领域:

  • 电气工程 电气工程
  • 计算机科学 计算机科学
  • 信号处理 信号处理

背景情况:

  • 室内本地化对于局部服务 (LBS) 在封闭环境中至关重要.
  • 接收信号强度 (RSS) 对细粒度的室内定位有局限性.
  • 频道状态信息 (CSI) 为室内定位提供了更详细的功能.

研究的目的:

  • 使用CSI指纹设计和评估两种新的室内定位方法.
  • 为了比较基于振幅和全维CSI指纹的性能.
  • 为了提高室内定位准确度,在具有挑战性的环境,如道和矿山.

主要方法:

  • 开发了基于 amplitude-of-CSI 的室内指纹本地化 (AmpFi),使用改进的加权K-最近邻居 (IWKNN).
  • 拟议的基于CSI的全维室内指纹本地化 (FuFi) 使用MIMO系统中所有子载体的规范振幅.
  • 在商业网络接口卡 (NIC) 上实现并测试了AmpFi和FuFi.

主要成果:

  • 富菲利用所有子载体作为独立的功能,提供全面的指纹.
  • AmpFi仅使用CSI的振幅进行本地化.
  • 与其他几种典型的基于指纹的室内定位方法相比,FuFi表现出卓越的性能.
关键词:
我认为我知道.频道状态信息 频道状态信息基于指纹的指纹.完全维度的子载体.室内局部化 室内局部化

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结论:

  • CSI指纹是一个可行的和有效的技术,用于局限空间的室内定位.
  • 全维CSI方法 (FuFi) 与基于振幅的方法和现有技术相比,提供了显著的改进.
  • 拟议的方法对道,矿山和其他室内环境中的LBS具有实际意义.