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Related Concept Videos

Introduction to Global Positioning System01:30

Introduction to Global Positioning System

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,...
Field Application of Global Positioning System01:28

Field Application of Global Positioning System

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...
Errors in Global Positioning System01:26

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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,...
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...
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 served as...
Local Attraction01:22

Local Attraction

Local attraction refers to disturbances in compass readings caused by magnetic influences from nearby objects such as metal fences, buried pipes, vehicles, buildings, power lines, or natural iron ore deposits. Small items like wristwatches, steel tools, or belt buckles can also interfere with the compass by creating local magnetic fields that distort the Earth's natural magnetic field. These distortions lead to inaccurate readings, posing navigation and land surveying challenges.Local...

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Updated: May 26, 2026

Using a Real-Time Locating System to Measure Walking Activity Associated with Wandering Behaviors Among Institutionalized Older Adults
04:13

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

Published on: February 8, 2019

Reliable location-based services from radio navigation systems.

Di Qiu1, Dan Boneh, Sherman Lo

  • 1Aeronautics & Astronautics Department, Stanford University, Durand Building, Stanford, CA 94305, USA. qiudi@stanford.edu

Sensors (Basel, Switzerland)
|December 14, 2011
PubMed
Summary
This summary is machine-generated.

This study leverages Loran-C navigation for enhanced security. It introduces a reproducible location tag, difficult to predict, securing devices against unauthorized access even with signal spoofing.

Keywords:
Loran-Clocation taglocation-based security

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Area of Science:

  • Navigation Systems
  • Cybersecurity
  • Signal Processing

Background:

  • Loran-C, a radio-based navigation system, offers high power and accuracy.
  • Traditional navigation systems have limitations in robust security applications.
  • Existing security measures can be vulnerable to sophisticated attacks.

Purpose of the Study:

  • To adapt Loran-C for advanced security applications.
  • To develop a precise yet unpredictable location tagging mechanism.
  • To enhance device security against physical theft and signal spoofing.

Main Methods:

  • Deriving a precise location tag (20m sensitivity) using Loran-C signals.
  • Employing fuzzy extractors, adapted for radio errors, to ensure tag reproducibility.
  • Conducting experiments to validate the tag's unpredictability and effectiveness.

Main Results:

  • A reproducible location tag with high precision was successfully generated.
  • The location tag demonstrated significant difficulty in being predicted from a distance.
  • Experimental data confirmed the system's effectiveness in preventing unauthorized access.

Conclusions:

  • Loran-C's characteristics are highly suitable for novel security applications.
  • The developed location tag provides a robust security layer for sensitive devices.
  • This approach offers a promising solution for location-aware security without revealing exact coordinates.