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Related Concept Videos

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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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) 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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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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Root-Locus Method01:19

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A cruise control system in a car is designed to maintain a specified speed automatically by adjusting the gas pedal. The system continuously measures the vehicle's speed and makes fine adjustments to the pedal to achieve this goal. The root locus method is particularly useful for understanding how the cruise control system's behavior changes under varying conditions, such as when the car goes uphill, downhill, or faces strong wind resistance.
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Fast and Fault-Tolerant Passive Hyperbolic Localization Using Sensor Consensus.

Gyula Simon1, Gergely Zachár2

  • 1Alba Regia Technical Faculty, Óbuda University, 8200 Székesfehérvár, Hungary.

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Summary

This study introduces a fast computational method to improve passive hyperbolic localization accuracy in non-line-of-sight scenarios. The new algorithm enhances location estimates using consensus functions, proven effective through simulations and real-world data.

Keywords:
TDOAconsensus functionemitter localizationfault tolerantsource localization

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Area of Science:

  • Signal Processing
  • Localization Algorithms
  • Computational Geometry

Background:

  • Passive hyperbolic localization using Time Difference of Arrival (TDOA) is susceptible to errors in non-line-of-sight (NLOS) environments.
  • Consensus functions offer a robust approach to mitigate these errors and achieve accurate positioning.

Purpose of the Study:

  • To develop a computationally efficient method for maximizing consensus functions in TDOA-based localization.
  • To ensure the global convergence and mathematical validity of the proposed algorithm.

Main Methods:

  • A fast branch-and-bound computational technique is proposed for global maximum finding.
  • The algorithm's global convergence property is rigorously proven mathematically.

Main Results:

  • The branch-and-bound method efficiently identifies the global maximum of consensus functions.
  • Simulations and real-world measurements demonstrate the method's effectiveness in improving localization accuracy under NLOS conditions.

Conclusions:

  • The proposed fast branch-and-bound algorithm provides a robust and mathematically proven solution for enhancing passive hyperbolic localization in challenging NLOS environments.
  • This method offers improved accuracy for TDOA-based systems operating with consensus functions.