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Field Application of Global Positioning System01:28

Field Application of Global Positioning System

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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...
210
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

218
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...
218
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

320
Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over...
320
Errors in Global Positioning System01:26

Errors in Global Positioning System

231
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,...
231
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

283
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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Distance Measurements by Taping01:18

Distance Measurements by Taping

304
Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
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Related Experiment Video

Updated: Dec 6, 2025

Using a Real-Time Locating System to Measure Walking Activity Associated with Wandering Behaviors Among Institutionalized Older Adults
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Using a Real-Time Locating System to Measure Walking Activity Associated with Wandering Behaviors Among Institutionalized Older Adults

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UWB-Based Self-Localization Strategies: A Novel ICP-Based Method and a Comparative Assessment for Noisy-Ranges-Prone

Francisco Bonnin-Pascual1, Alberto Ortiz1

  • 1Department of Mathematics and Computer Science, University of the Balearic Islands, 07122 Palma de Mallorca, Spain.

Sensors (Basel, Switzerland)
|October 6, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces a novel Iterative Closest Point (ICP) method for accurate 3D positioning using Ultra-Wide-Band (UWB) systems in challenging indoor environments. The approach enhances reliability by filtering signals and selecting optimal anchor subsets for improved robot localization.

Keywords:
UWB positioning systemferromagnetic interferencepoint-to-sphere ICPrange filtering

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Area of Science:

  • Robotics and Automation
  • Indoor Positioning Systems
  • Signal Processing

Background:

  • Ultra-Wide-Band (UWB) systems offer potential for indoor localization but suffer accuracy degradation due to environmental interference.
  • Metallic structures and signal multipath effects in GPS-denied areas challenge UWB positioning accuracy.

Purpose of the Study:

  • To develop a robust 3D positioning method for UWB tags in challenging indoor environments.
  • To enhance the accuracy and reliability of UWB positioning by mitigating environmental noise and signal interference.

Main Methods:

  • A novel point-to-sphere Iterative Closest Point (ICP) algorithm is proposed for UWB tag 3D position estimation.
  • An anchor subset selection strategy is implemented to minimize position uncertainty.
  • Pre-filtering of anchor-tag distances and post-filtering using non-linear Kalman Filtering are incorporated to improve robustness.

Main Results:

  • The proposed ICP-based method demonstrates good performance in both laboratory and noisy vessel environments.
  • Experimental results show the effectiveness of the anchor subset selection and filtering stages in improving position accuracy.
  • The ICP algorithm outperforms traditional trilateration methods in challenging, noise-prone scenarios.

Conclusions:

  • The novel ICP-based UWB positioning method provides a reliable solution for indoor localization, especially in environments with signal interference.
  • The integration of filtering techniques and intelligent anchor selection significantly enhances the accuracy and robustness of UWB positioning systems.
  • This approach offers a viable alternative for precise agent localization in GPS-denied settings.