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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) 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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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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Related Experiment Video

Updated: Dec 31, 2025

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
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Low cost satellite constellations for nearly continuous global coverage.

Lake A Singh1, William R Whittecar2, Marc D DiPrinzio3

  • 1GEOINT Innovations Office, The Aerospace Corporation, Chantilly, VA, 20151, USA. lake.a.singh@aero.org.

Nature Communications
|January 12, 2020
PubMed
Summary

Discovering new satellite constellations with 24- and 48-hour periods offers nearly continuous global coverage. These innovative designs harness orbital forces to significantly cut costs and extend satellite lifespan.

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Area of Science:

  • Space Science
  • Orbital Mechanics
  • Satellite Engineering

Background:

  • Satellite services are crucial for the global economy, balancing coverage and cost.
  • Current satellite designs face limitations in achieving continuous global coverage efficiently.

Purpose of the Study:

  • To discover novel satellite constellations offering near-continuous global coverage.
  • To explore cost-reduction strategies for satellite operations through orbital dynamics.

Main Methods:

  • Investigated two alternative 4-satellite constellations with 24- and 48-hour periods.
  • Analyzed the utilization of nonlinear orbital perturbation forces (geopotential, solar/lunar gravity, solar radiation pressure).
  • Assessed trade-offs between global coverage and operational costs.

Main Results:

  • Achieved nearly continuous global coverage with both 4-satellite constellations.
  • Demonstrated significant propellant and maintenance cost reductions by harnessing perturbation forces.
  • Identified that minor coverage sacrifices at specific longitudes enable viable, lower-cost operations.

Conclusions:

  • The 24-hour period constellation offers approximately 60% propellant mass savings versus geostationary Earth orbit (GEO) constellations.
  • Reduced mass-to-orbit costs allow for less expensive launch vehicles and enhanced mission capabilities.
  • These findings enable longer satellite design life and improved mission value.