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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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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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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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An Improved Indoor Positioning System Using RGB-D Cameras and Wireless Networks for Use in Complex Environments.

Jaime Duque Domingo1, Carlos Cerrada2, Enrique Valero3

  • 1Departamento de Ingeniería de Software y Sistemas Informáticos, ETSI Informática, UNED, C/Juan del Rosal, 16, 28040 Madrid, Spain. jaimeduque@amenofis.com.

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Summary

This study introduces an indoor positioning system combining WiFi and depth maps for accurate, non-intrusive location tracking. The novel approach enhances performance and range in complex environments without personal data.

Keywords:
IPSKinectRGB-D sensorsWPSWiFidepth mapfingerprintingindoor positioningskeletonstrajectory

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Area of Science:

  • Robotics and Computer Vision
  • Ubiquitous Computing
  • Sensor Fusion

Background:

  • Accurate indoor positioning is challenging due to complex environments and signal interference.
  • Existing WiFi positioning systems often lack precision and robustness in dynamic settings.
  • Privacy concerns limit the use of intrusive tracking methods.

Purpose of the Study:

  • To develop and evaluate a novel indoor positioning system (IPS).
  • To enhance location accuracy and operational range in complex, inhabited indoor spaces.
  • To create a non-intrusive system requiring only user-carried smartphones.

Main Methods:

  • Fusion of WiFi positioning data with depth map information from RGB-D cameras.
  • Development of algorithms to integrate sensor data for precise localization.
  • Implementation of a non-intrusive system that does not require personal subject information.

Main Results:

  • Significant improvements in accuracy and performance compared to traditional WiFi-based solutions.
  • Extended operational range for indoor positioning.
  • Demonstrated effectiveness in complex, multi-room environments with moving people.

Conclusions:

  • The combined WiFi and depth map approach offers a robust and accurate solution for indoor positioning.
  • The system provides a non-intrusive and privacy-preserving alternative for tracking individuals.
  • This technology has the potential to significantly advance applications requiring precise indoor localization.