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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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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...
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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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SALOS-A UWB Single-Anchor Indoor Localization System Based on a Statistical Multipath Propagation Model.

Sven Ole Schmidt1, Marco Cimdins1, Fabian John1

  • 1Department of Electrical Engineering and Computer Science, Technische Hochschule Lübeck-University of Applied Sciences, Mönkhofer Weg 239, 23562 Lübeck, Germany.

Sensors (Basel, Switzerland)
|April 27, 2024
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Summary

A new UWB Single-Anchor Localization System (SALOS) reduces costs by modeling signal paths, eliminating the need for multiple anchors. This system achieves over 73% accuracy in challenging indoor environments.

Keywords:
DW1000UWBchannel impulse responseindoor localizationmultipath propagation modeloptimal anchor positioningsignal processingsingle-anchor localization

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Area of Science:

  • Electrical Engineering
  • Indoor Positioning Systems
  • Signal Processing

Background:

  • Multi-anchor Ultra-Wideband (UWB) systems are common for industrial indoor localization but are costly and complex to install.
  • Exploiting UWB signal multipath propagation offers a way to reduce infrastructure requirements and costs.

Purpose of the Study:

  • To evaluate the UWB Single-Anchor Localization System (SALOS) in challenging indoor environments with complex multipath propagation.
  • To develop and implement new algorithms for SALOS, focusing on sophisticated signal modeling without requiring reference measurements.

Main Methods:

  • Developed a 3D statistical multipath propagation model for arbitrary spatial geometries.
  • Modeled signal propagation, including path length and complex amplitudes, between anchors and candidate tag positions.
  • Compared modeled signals to UWB measurements using a similarity metric and performed a majority decision for position estimation.

Main Results:

  • Implemented SALOS in a modular fashion within a building for indoor evaluation.
  • Achieved correct position estimations for over 73% of measurements across a fixed grid of 20 positions.
  • Demonstrated the system's effectiveness in an indoor setting with unpredictable multipath propagation.

Conclusions:

  • SALOS offers a cost-effective alternative to multi-anchor UWB localization systems for indoor environments.
  • The developed algorithms and signal modeling approach enable accurate positioning without prior training or fingerprinting.
  • The system shows significant potential for industrial indoor localization applications despite challenging propagation conditions.