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Related Concept Videos

Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

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...
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

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 Device01:30

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

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...
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

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Related Experiment Video

Updated: May 28, 2026

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
09:01

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A Method for Enhancing the Positioning Performance of PPP-B2b by Integrating Galileo Observation.

Xuena Shang1, Liwenle Liu2, Yilong Yuan3

  • 1School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan 430079, China.

Sensors (Basel, Switzerland)
|May 27, 2026
PubMed
Summary

Adding Galileo to BeiDou-3 Precise Point Positioning (PPP-B2b) service significantly improves satellite visibility and reduces convergence times for decimeter-level positioning. This triple-system approach enhances real-time positioning accuracy and robustness, especially in challenging environments.

Keywords:
GalileoPPP-B2bbroadcast ephemerisprecise point positioning

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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Last Updated: May 28, 2026

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
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Published on: August 12, 2013

Area of Science:

  • Geodesy and Geomatics Engineering
  • Satellite Navigation Systems
  • Geophysical Sciences

Background:

  • BeiDou-3 Precise Point Positioning (PPP-B2b) service offers decimeter-level accuracy by broadcasting corrections via GEO satellites, eliminating reliance on ground networks.
  • Current PPP-B2b services are limited to BDS-3 and GPS, potentially impacting performance in environments with fewer visible satellites.
  • Enhancing satellite constellation coverage is crucial for improving the robustness and availability of precise positioning services.

Purpose of the Study:

  • To investigate the feasibility and benefits of integrating Galileo satellite observations into the existing PPP-B2b positioning framework.
  • To evaluate the impact of incorporating Galileo on positioning accuracy, convergence time, and overall PPP performance.
  • To provide a practical method for enhancing real-time high-precision positioning capabilities.

Main Methods:

  • Established a Precise Point Positioning (PPP) model that integrates the PPP-B2b service with broadcast ephemeris from multiple satellite systems.
  • Assessed the accuracy of Galileo broadcast ephemeris by comparing it with precise orbit and clock products (mean SISRE std dev of 0.30).
  • Conducted positioning experiments using data from 94 reference stations in China over 7 days, analyzing performance under varying elevation cutoff angles.

Main Results:

  • Incorporating Galileo satellites significantly increased the number of visible satellites and improved satellite geometry.
  • The BDS-3/GPS/Galileo triple-system solution reduced horizontal convergence time by 13.70-16.67% and vertical convergence time by 18.75-20.00% compared to the dual-system solution.
  • The triple-system solution demonstrated improved PPP availability, continuity, and robustness, with smaller re-convergence jumps under abnormal conditions.

Conclusions:

  • Integrating Galileo observations into the PPP-B2b service effectively enhances positioning performance, convergence speed, and reliability.
  • The proposed triple-system approach offers a simple and practical method for achieving high-precision real-time positioning.
  • This enhancement is particularly beneficial in challenging environments where satellite visibility might be limited.