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Related Concept Videos

IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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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...
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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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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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Channel State Information Based Indoor Fingerprinting Localization.

Rongjie Che1, Honglong Chen2

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

Sensors (Basel, Switzerland)
|July 14, 2023
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Summary
This summary is machine-generated.

This study introduces two WiFi-based indoor localization methods, AmpFi and FuFi, using channel state information (CSI) for precise positioning in confined spaces like tunnels. FuFi demonstrates superior performance over existing techniques.

Keywords:
IWKNNchannel state informationfingerprinting-basedfull-dimensional subcarriersindoor localization

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Area of Science:

  • Electrical Engineering
  • Computer Science
  • Signal Processing

Background:

  • Indoor localization is crucial for location-based services (LBSs) in confined environments.
  • Received Signal Strength (RSS) has limitations for fine-grained indoor positioning.
  • Channel State Information (CSI) offers a more detailed feature for indoor localization.

Purpose of the Study:

  • To design and evaluate two novel indoor localization approaches using CSI fingerprinting.
  • To compare the performance of amplitude-based and full-dimensional CSI fingerprinting.
  • To enhance indoor localization accuracy in challenging environments like tunnels and mines.

Main Methods:

  • Developed amplitude-of-CSI-based indoor fingerprinting localization (AmpFi) using improved weighted K-nearest neighbor (IWKNN).
  • Proposed full-dimensional CSI-based indoor fingerprinting localization (FuFi) utilizing normalized amplitudes of all subcarriers in a MIMO system.
  • Implemented and tested both AmpFi and FuFi on commercial network interface cards (NICs).

Main Results:

  • FuFi utilizes all subcarriers as independent features, providing a comprehensive fingerprint.
  • AmpFi uses only the amplitude of CSI for localization.
  • FuFi demonstrated superior performance compared to several other typical fingerprinting-based indoor localization approaches.

Conclusions:

  • CSI fingerprinting is a viable and effective technique for indoor localization in confined spaces.
  • The full-dimensional CSI approach (FuFi) offers significant improvements over amplitude-based methods and existing techniques.
  • The proposed methods have practical implications for LBSs in tunnels, mines, and other indoor environments.