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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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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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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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The Global Positioning System (GPS) revolutionized positioning on Earth, providing precise location data through satellite ranging. The GPS system was developed in 1978 by the U.S. Department of Defense  for military use, and it became available for civilian applications in 1983, transforming fields including navigation, fleet management, and time synchronization for telecommunications systems.GPS consists of satellites in medium Earth orbit, about 20,200 kilometers above the surface,...
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Influence of Earth's Curvature and Atmospheric Refraction on Leveling01:26

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During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance.
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An Enhanced Indoor Three-Dimensional Localization System with Sensor Fusion Based on Ultra-Wideband Ranging and Dual

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  • 1Department of Mechatronics Engineering, Hanyang University, Ansan 15588, Republic of Korea.

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Summary

This study presents an advanced 3D indoor localization system using ultra-wideband (UWB) and barometric pressure (BMP) sensors. The enhanced system achieves high accuracy for spatial localization and height estimation, improving data processing and stability.

Keywords:
Kalman filterbarometric pressure sensorindoor localizationultra-wideband sensor

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Area of Science:

  • Robotics and Automation
  • Sensor Technology
  • Geospatial Information Systems

Background:

  • Accurate 3D indoor localization is essential for applications like asset tracking and augmented reality.
  • Existing systems face challenges in precision, especially for height estimation.
  • Previous work established dual barometric pressure (BMP) sensors for indoor height measurement.

Purpose of the Study:

  • To develop an advanced 3D indoor localization system with improved accuracy and stability.
  • To integrate updated ultra-wideband (UWB) and dual BMP sensors for precise spatial and height determination.
  • To enhance data processing speed and reliability for real-world applications.

Main Methods:

  • Integration of three fixed UWB anchors and dual BMP sensors.
  • Application of geometric modeling and Kalman filtering for 3D spatial localization.
  • Development of a new geometric localization model and an optimized Kalman filtering algorithm.

Main Results:

  • Significant reduction in localization error and improved height accuracy (±0.05 m).
  • Root Mean Square Error (RMSE) for 3D localization reached 0.0740 m.
  • Demonstrated expanded locatable space and faster data output rates.

Conclusions:

  • The proposed system offers a substantial advancement in 3D indoor localization accuracy and performance.
  • The integration of UWB and BMP sensors provides reliable and precise spatial awareness.
  • The system supports advanced applications demanding detailed 3D indoor positioning.