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  2. The current GPS constellation includes 24 satellites, each traveling in a 12-hour, circular orbit, 20,200 kilometers above the Earth. The satellites are positioned so that six are observable nearly 100 percent of the time from any point on Earth.
    cddis.nasa.gov/Techniques/GNSS/GNSS_Overvie…
    Today the GPS satellite constellation (the space segment) consists of over 30 operational satellites, each equipped with redundant atomic clocks and tracked by a ground control network (the control segment).
    www.nasa.gov/directorates/somd/space-communic…
    The GPS constellation is a mix of old and new satellites. The following table summarizes the features of the current and future generations of GPS satellites, including Block IIA (2nd generation, "Advanced"), Block IIR ("Replenishment"), Block IIR-M ("Modernized"), Block IIF ("Follow-on"), GPS III, and GPS IIIF ("Follow-on").
    www.gps.gov/systems/gps/space/
    As a result, GPS now effectively operates as a 27-slot constellation with improved coverage in most parts of the world.
    gssc.esa.int/navipedia/index.php/GPS_Space_Seg…
    The 5 GNSS constellations include GPS (US), QZSS (Japan), BEIDOU (China), GALILEO (EU), and GLONASS (Russia).
    blog.bliley.com/the-differences-between-the-5-gns…
     
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  4. GPS.gov: Space Segment

    WEBJun 28, 2022 · As of July 3, 2023, there were a total of 31 operational satellites in the GPS constellation, not including the decommissioned, on-orbit spares. For more up-to-date constellation status information, visit …

  5. Global Positioning System - United States Space Force

    WEBThe Global Positioning System (GPS) is a constellation of orbiting satellites that provides position, navigation, and timing data to military and civilian users globally. The system is operated and controlled by Space Delta 8, …

  6. GPS Space Segment - Navipedia - European Space Agency

  7. GPS - NASA

  8. Global Positioning System (GPS) Overview | Navigation Center

  9. The Satellite Constellation | Time and Navigation

    WEBThe full suite of 24 satellites needed for global coverage was in orbit by early 1995. Beginning in the 1990s, Lockheed Martin built new generations of GPS satellites. More than 30 GPS satellites were operational after …

  10. GPS.gov: GPS Overview - GPS: The Global Positioning System

  11. GPS Data - CelesTrak

  12. Global Positioning System - Wikipedia

    WEBThe current GPS consists of three major segments. These are the space segment, a control segment, and a user segment. [51] The U.S. Space Force develops, maintains, and operates the space and control segments.

  13. Live World Map of Satellite Positions - In-The-Sky.org

  14. Global Positioning System - Space Operations Command (SpOC)

  15. Global Navigation Satellite System (GNSS) Overview - NASA

  16. GPS III/IIIF - Lockheed Martin

  17. The Almanac - GPS World

  18. Space Force eyes smaller, cheaper GPS satellites to augment …

  19. What's The Differences Between the 5 GNSS Constellations?

  20. List of GPS satellites - Wikipedia

  21. Other Global Navigation Satellite Systems (GNSS) - GPS: The …

  22. GPS: What is it and how does it work? | Space

  23. GPS Constellation | Navigation Center - navcen.uscg.gov

  24. Improved GPS tropospheric path delay estimation using

  25. GPS.gov: Image Library