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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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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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Movement Joints in Buildings01:27

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Movement joints in buildings are essential design elements that accommodate inevitable motions caused by various factors such as temperature changes, moisture content variations, and structural deflections. These motions, if not considered in design and construction, can lead to unsightly or dangerous damage. Movement joints are incorporated in different forms to manage these stresses and allow materials to move without causing distress.
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Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device01:30

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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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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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Accurate and Robust Floor Positioning in Complex Indoor Environments.

Jingyu Huang1, Haiyong Luo2, Wenhua Shao1

  • 1School of Software Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China.

Sensors (Basel, Switzerland)
|May 14, 2020
PubMed
Summary
This summary is machine-generated.

Accurate floor positioning in complex buildings is crucial. This study introduces a novel method combining Wi-Fi, barometric pressure, and motion detection, achieving 99.2% accuracy for robust indoor positioning.

Keywords:
HMMWi-Fibarometric pressurefloor positioningmotion detection

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Area of Science:

  • Indoor positioning systems
  • Wireless sensor networks
  • Machine learning applications

Background:

  • Accurate floor positioning is essential for indoor navigation in multi-story buildings.
  • Existing methods struggle with accuracy and robustness in complex structures like those with large open spaces.
  • The demand for precise indoor location-based services is rapidly increasing.

Purpose of the Study:

  • To develop a highly accurate and robust floor positioning method for complex multi-story buildings.
  • To overcome the limitations of current floor estimation techniques.

Main Methods:

  • A novel hybrid approach combining Wi-Fi-based floor positioning (BWFP) and barometric pressure-based floor positioning (BPFP) using Hidden Markov Models (HMM).
  • Integration of XGBoost-based user motion detection to enhance positioning accuracy.
  • Extensive experimental validation in complex building environments.

Main Results:

  • The proposed method achieved a remarkable 99.2% accuracy in floor estimation.
  • Demonstrated superior performance compared to existing state-of-the-art floor estimation techniques.
  • Showcased robustness in challenging indoor environments with large hollow areas.

Conclusions:

  • The hybrid floor positioning method offers a significant advancement in indoor positioning accuracy and robustness.
  • This approach effectively addresses the limitations of previous methods in complex building structures.
  • The findings pave the way for more reliable indoor location-based services.