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Related Concept Videos

Field Application of Global Positioning System01:28

Field Application of Global Positioning System

20
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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Types of Global Positioning System Surveys01:30

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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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Errors in Global Positioning System01:26

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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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

16
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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Introduction to Global Positioning System01:30

Introduction to Global Positioning System

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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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Related Experiment Video

Updated: May 17, 2025

An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field
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High-Precision Pedestrian Indoor Positioning Method Based on Inertial and Magnetic Field Information.

Ning Yu1, Xuanhe Chen1, Renjian Feng1

  • 1School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China.

Sensors (Basel, Switzerland)
|May 14, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a new pedestrian indoor positioning system using inertial navigation and magnetic fields. The method significantly reduces cumulative errors, improving trajectory accuracy for reliable navigation.

Keywords:
error suppressionfusion localization methodmagnetic fieldpedestrian indoor positioning methodtrajectory optimization

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Area of Science:

  • Robotics and Navigation
  • Geophysics and Geodesy

Background:

  • Pedestrian indoor positioning demands long-term, high-precision trajectory estimation.
  • Inertial Measurement Unit (IMU)-only methods suffer from cumulative errors and lack absolute positioning references.
  • Existing methods struggle with trajectory distortion due to accumulated drift.

Purpose of the Study:

  • To develop an enhanced pedestrian indoor positioning method.
  • To improve trajectory accuracy by mitigating cumulative errors.
  • To integrate inertial navigation with environmental magnetic field data.

Main Methods:

  • Utilized the Extended Kalman Filter (EKF) algorithm for data fusion.
  • Incorporated environmental magnetic field information as an external observation.
  • Combined inertial navigation system (INS) data with magnetic field measurements.

Main Results:

  • Significantly suppressed cumulative errors in both yaw angle and pedestrian pose.
  • Achieved a reduction in yaw angle error from 11.043° to 4.778° over 297.08 m.
  • Decreased position error from 8.999 m to 0.364 m, with relative average error dropping from 3.02% to 0.12%.

Conclusions:

  • The proposed fusion method effectively enhances pedestrian indoor positioning accuracy.
  • Integrating magnetic field data with INS via EKF overcomes limitations of IMU-only systems.
  • This approach offers a robust solution for high-precision, long-term indoor navigation.