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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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To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
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A survey team is tasked with determining the elevation difference between points Point A and Point B, separated by uneven terrain. They use a leveling instrument and a leveling rod.Common MistakesMisreading the Rod: During a backsight reading at Point A, the instrumentman observes the rod partially obscured by tall grass. Instead of reading 1.135 m, they mistakenly record 1.735 m due to the misalignment of the crosshair with the wrong graduation. This error adds 0.600 m to all subsequent...
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Field Application of Global Positioning System01:28

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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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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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Updated: Jun 25, 2025

Using a Real-Time Locating System to Measure Walking Activity Associated with Wandering Behaviors Among Institutionalized Older Adults
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Location-Aware Range-Error Correction for Improved UWB Localization.

Sander Coene1, Chenglong Li2, Sebastian Kram3

  • 1WAVES Group, Department of Information Technology, Ghent University-imec, 9052 Ghent, Belgium.

Sensors (Basel, Switzerland)
|May 25, 2024
PubMed
Summary
This summary is machine-generated.

We introduce location-aware ranging correction (LARC) to improve ultra wideband (UWB) ranging accuracy. This method enhances localization performance by using location estimates to correct errors, achieving significant improvements without extra hardware.

Keywords:
localizationsignal processing algorithmstime of arrival estimationultra wideband technology

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Area of Science:

  • Robotics
  • Sensor Fusion
  • Wireless Communication

Background:

  • Existing ultra wideband (UWB) ranging correction methods rely on channel information.
  • These methods often lack robustness and can overfit.
  • There is a need for improved ranging accuracy without additional hardware.

Purpose of the Study:

  • To present a novel localization scheme, location-aware ranging correction (LARC), for UWB signals.
  • To enhance ranging accuracy by incorporating preliminary location estimates into the correction model.
  • To improve localization performance without requiring extra hardware like inertial measurement units (IMUs).

Main Methods:

  • Developed the LARC scheme integrating location-based features into a range-error prediction model.
  • Utilized an open-access UWB measurement dataset for distances up to 20 meters.
  • Employed a simple regression model executable in real-time on a CPU.

Main Results:

  • Reduced the 90th percentile (P90) ranging error by 58% to 15 cm for an unseen trajectory.
  • Improved the 2D localization P90 error by 21% to 18 cm.
  • Demonstrated robustness in a changed environment with moved metallic objects, achieving 56% better P90 ranging (16 cm) and a 17% improvement in 2D localization (18 cm).

Conclusions:

  • The LARC method significantly enhances UWB ranging and localization accuracy.
  • The approach is robust to environmental changes and does not require additional hardware.
  • LARC offers a practical and efficient solution for real-time UWB positioning.