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Related Concept Videos

Errors in Global Positioning System01:26

Errors in Global Positioning System

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 System

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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Types of Global Positioning System Surveys

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Related Experiment Videos

Improving Smartphone GNSS Positioning Accuracy Using Contextual Information.

Bong-Gyu Park1, Jong-Sung Lee1, Miso Kim1,2

  • 1Department of Geoinformatic Engineering, Inha University, 100 Inha-ro, Incheon 22212, Republic of Korea.

Sensors (Basel, Switzerland)
|June 12, 2026
PubMed
Summary

This study enhances smartphone global satellite navigation system positioning accuracy in urban areas using contextual information. The methods improve reliability by refining satellite signal quality and detecting errors, leading to significantly better location accuracy.

Keywords:
ECIGNSSKalman filterRTKadaptive Kalman filteringadaptive positioningsmartphone

Related Experiment Videos

Area of Science:

  • * Geomatics Engineering
  • * Mobile Positioning Systems
  • * Signal Processing

Background:

  • * Smartphones are crucial for location-based services, demanding precise global satellite navigation system (GNSS) positioning.
  • * Urban environments pose significant challenges to GNSS accuracy due to smartphone limitations and multipath signal interference.
  • * Existing methods struggle to provide reliable positioning in complex urban settings.

Purpose of the Study:

  • * To develop and evaluate novel methods for enhancing GNSS positioning accuracy on smartphones in urban areas.
  • * To leverage contextual information to overcome signal degradation and multipath effects.
  • * To improve the reliability and precision of location-based services in challenging environments.

Main Methods:

  • * Integration of an environmental context indicator to refine the C/N0-based observation covariance model.
  • * Utilization of normalized C/N0 and code-pseudorange residuals for non-line-of-sight satellite detection.
  • * Adjustment of observation covariance based on detected satellite visibility and signal quality.

Main Results:

  • * Achieved submeter to decimeter-level horizontal accuracy and precision in open areas.
  • * Demonstrated significant reductions in positioning errors in semi-urban and urban canyon environments.
  • * Reported approximate decreases of 8m (CEP95), 2m (CEP50), and 4m (DRMS) in semi-urban areas.
  • * Reported approximate decreases of 15m (CEP95), 2m (CEP50), and 5m (DRMS) in urban canyons.

Conclusions:

  • * The proposed contextual information-based methods effectively enhance GNSS positioning accuracy on smartphones.
  • * The techniques successfully mitigate the impact of urban environments on positioning performance.
  • * The study provides a pathway for more reliable and accurate location-based services in challenging scenarios.