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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...
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...
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,...
Trigonometric Substitution01:23

Trigonometric Substitution

Trigonometric substitution is a technique used to simplify integrals that contain square root expressions involving quadratic forms. It is particularly effective when the integrand includes terms resembling those found in standard geometric equations, such as circles or ellipses.Molniya satellites follow highly elliptical orbits, repeatedly sweeping out the same regions of space as they revolve around Earth. To estimate the area enclosed by such an orbit, the path is modeled as an ellipse...

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Related Experiment Video

Updated: May 30, 2026

Image-based Lagrangian Particle Tracking in Bed-load Experiments
10:32

Image-based Lagrangian Particle Tracking in Bed-load Experiments

Published on: July 20, 2017

Autonomous subpixel satellite track end point determination for space-based images.

Lance M Simms1

  • 1Lawrence Livermore National Laboratory, Livermore, California, 94550 USA. simms8@llnl.gov

Applied Optics
|August 12, 2011
PubMed
Summary

This study introduces a new algorithm for precisely locating satellite track endpoints in space-based images, even with significant track curvature. The method achieves subpixel resolution, improving accuracy for satellite trajectory analysis.

Related Experiment Videos

Last Updated: May 30, 2026

Image-based Lagrangian Particle Tracking in Bed-load Experiments
10:32

Image-based Lagrangian Particle Tracking in Bed-load Experiments

Published on: July 20, 2017

Area of Science:

  • Space Science
  • Image Processing
  • Astrodynamics

Background:

  • Accurate determination of satellite positions is crucial for orbital mechanics and space situational awareness.
  • Existing methods may struggle with curved satellite tracks caused by spacecraft rotation in imagery.
  • Subpixel resolution is needed for high-precision tracking and analysis.

Purpose of the Study:

  • To develop and present an algorithm for determining satellite track endpoints with subpixel resolution.
  • To address the challenge of significant track curvature in space-based imagery.
  • To validate the algorithm's effectiveness using real and simulated data.

Main Methods:

  • An algorithm was developed to identify satellite track end points.
  • The algorithm accounts for track curvature resulting from spacecraft rotation.
  • Subpixel resolution techniques were employed for enhanced endpoint localization.

Main Results:

  • The algorithm successfully determined satellite track endpoints with subpixel accuracy.
  • Effectiveness was demonstrated on both real ground-based and simulated space-based images.
  • The method proved robust in handling significant track curvature.

Conclusions:

  • The presented algorithm offers a robust solution for subpixel satellite track endpoint determination.
  • It effectively handles curved tracks, enhancing precision in space-based image analysis.
  • This advancement has implications for improved satellite tracking and space domain awareness.