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Related Concept Videos

Introduction to Global Positioning System

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 System

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 System

Errors in Global Positioning System

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,...

Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device

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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...

Types of Global Positioning System Surveys

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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...

Selected Data About Geographic Locations

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Related Experiment Videos

Seamless positioning and navigation by using geo-referenced images and multi-sensor data.

Xun Li¹, Jinling Wang, Tao Li

¹School of Civil and Environmental Engineering, University of New South Wales, Sydney 2052, NSW, Australia. xun.li@student.unsw.edu.au

Sensors (Basel, Switzerland)

|July 17, 2013

Summary

This study introduces a hybrid visual positioning system to enhance location-based services. The system improves positioning accuracy in challenging GPS-denied environments like urban canyons and indoors.

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Area of Science:

Computer Vision
Robotics
Geomatics Engineering

Background:

Location-Based Services (LBS) demand ubiquitous positioning, challenging for current satellite navigation in indoor and urban canyon environments.
Vision-based methods offer potential for LBS due to widespread mobile cameras, but existing image processing techniques have limitations for navigation.

Purpose of the Study:

To develop a hybrid image-based positioning system for seamless six degrees of freedom (6DoF) positioning.
To enhance location-based services in both outdoor and indoor environments, addressing GPS signal limitations.

Main Methods:

A hybrid system combining visual sensor input with geo-referenced image matching for positioning.
Integration of onboard sensors like GPS receivers and digital compasses to augment visual methods.

Main Results:

The hybrid system significantly improves position accuracy in GPS-challenged areas, such as urban canyons.
Demonstrates excellent position accuracy in indoor environments, overcoming traditional navigation limitations.

Conclusions:

The proposed hybrid system offers a robust solution for ubiquitous positioning across diverse environments.
Enhances the reliability and accuracy of location-based services where GPS is unreliable or unavailable.