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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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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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Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
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Introduction to Global Positioning System01:30

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Airborne relay-based regional positioning system.

Kyuman Lee1, Hongjun Noh2, Jaesung Lim3

  • 1Department of Computer Engineering, Ajou University, 206 World cup-ro, Yeongtong-gu, Suwon 443-749, Korea. mool717@ajou.ac.kr.

Sensors (Basel, Switzerland)
|June 2, 2015
PubMed
Summary
This summary is machine-generated.

This study introduces an airborne relay-based positioning system to overcome limitations of ground-based and conventional airborne pseudolite systems. The proposed method enhances accuracy by enabling users to estimate relay locations and their own position simultaneously.

Keywords:
GNSS-independent systemairborne relayground-based positioning

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Area of Science:

  • Navigation Systems
  • Geomatics Engineering
  • Aerospace Technology

Background:

  • Ground-based pseudolite systems suffer from low vertical accuracy, multipath, and near-far issues.
  • Airborne-based systems mitigate some issues but require pseudolite position monitoring, causing performance degradation due to platform mobility.
  • Existing systems face challenges with accuracy and real-time performance in dynamic environments.

Purpose of the Study:

  • To propose a novel airborne relay-based regional positioning system.
  • To address the limitations of existing ground-based and airborne pseudolite systems.
  • To improve positioning accuracy and overcome performance degradation caused by pseudolite mobility.

Main Methods:

  • A system architecture comprising a master station, ground reference stations, airborne relays, and a user.
  • Navigation signals generated by ground reference stations and relayed by airborne platforms.
  • Sequential estimation of airborne relay locations and user position by the end-user.
  • Simulation-based performance evaluation.

Main Results:

  • The proposed system demonstrates higher accuracy compared to conventional airborne-based pseudolite systems.
  • The system is feasible and maintains accuracy even with clock offsets among reference stations.
  • Simultaneous estimation eliminates monitoring delays and mitigates accuracy degradation from airborne relay movement.

Conclusions:

  • The airborne relay-based regional positioning system offers a viable solution for enhanced accuracy and robustness.
  • The proposed method effectively overcomes the limitations of traditional pseudolite navigation systems.
  • This approach provides a feasible and accurate positioning solution for dynamic environments.