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Field Application of Global Positioning System01:28

Field Application of Global Positioning System

112
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...
112
Introduction to Global Positioning System01:30

Introduction to Global Positioning System

171
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,...
171
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

186
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...
186
Errors in Global Positioning System01:26

Errors in Global Positioning System

126
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,...
126
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

131
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...
131
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

141
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...
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Related Experiment Video

Updated: Sep 29, 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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Development of a Novel Railway Positioning System Using RFID Technology.

Osama Olaby1, Moussa Hamadache1, David Soper1

  • 1Birmingham Centre for Railway Research and Education (BCRRE), School of Engineering, University of Birmingham, Birmingham B15 2TT, UK.

Sensors (Basel, Switzerland)
|March 26, 2022
PubMed
Summary
This summary is machine-generated.

Radio Frequency Identification (RFID) technology offers precise train positioning on railways. Passive RFID is most suitable for aligning vehicles with switch and crossing (S&C) positions, improving location accuracy.

Keywords:
RFID technologypositioning systemrailwaytrack switch and crossing

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Area of Science:

  • Railway Engineering
  • Geospatial Technology
  • Automation and Control Systems

Background:

  • Current train positioning systems on railway networks suffer from limited precision.
  • Accurate vehicle location is crucial for monitoring equipment like the track recording vehicle (TRV).
  • Aligning vehicle data with specific switch and crossing (S&C) locations requires enhanced precision.

Purpose of the Study:

  • To test and validate the suitability of Radio Frequency Identification (RFID) technology for precise train positioning.
  • To assess RFID's capability in aligning railway vehicles with switch and crossing (S&C) positions.
  • To establish a definitive reference point for vehicle location using S&C key features.

Main Methods:

  • Installation of two RFID tags on switch-toe and crossing-nose sleepers.
  • Utilization of an RFID reader installed underneath the monitoring vehicle.
  • Conducting over 400 tests with passive and semi-passive RFID under varied conditions (speed, distance, signal strength).

Main Results:

  • Passive RFID technology demonstrated superior performance compared to semi-passive RFID.
  • The proposed RFID system successfully provided S&C identification and GPS coordinates as vehicles passed.
  • Lab testing and data analysis confirmed the viability of the RFID-based positioning concept.

Conclusions:

  • Passive RFID technology is the most suitable for precise vehicle alignment to S&C positions.
  • The developed RFID solution offers a significant improvement in train location accuracy within the network.
  • This technology provides a definitive reference point for train positioning, enhancing operational data.