Modernizing and Expanding the NASA Space Geodesy Network to Meet Future Geodetic Requirements

Area of Science:

• Geodesy and Earth Observation
• Space Geodesy
• Geophysical and Astronomical Sciences

Background:

• The NASA Space Geodesy Network (NSGN) operates global ground stations for Very Long Baseline Interferometry (VLBI), Satellite Laser Ranging (SLR), and Global Navigation Satellite System (GNSS).
• Current geodetic products support Earth observations, but the US National Research Council (NRC) and Global Geodetic Observing System (GGOS) aim for a 1-millimeter accurate and 0.1-millimeter per year stable Terrestrial Reference Frame (TRF).
• This goal represents a significant advancement beyond current geodetic capabilities.

Purpose of the Study:

• To describe critical gaps in the current global geodetic network.
• To outline how the new NSGN will enhance global geodetic coverage and improve geodetic products.
• To detail the characteristics and capabilities of modern NSGN sites and next-generation NASA SLR and VLBI systems.

Main Methods:

• Planning and implementing modern geodetic stations co-located at existing and new global sites.
• Demonstrating next-generation systems at prototype sites.
• Implementing new VLBI and SLR stations and replacing aging legacy stations.

Main Results:

• A prototype next-generation core site was demonstrated in 2013.
• A new broadband VLBI station in Hawaii was completed in 2016.
• New VLBI and SLR stations are being implemented in Texas, with plans to replace other aging stations.

Conclusions:

• The new NSGN will expand global geodetic coverage, addressing critical network gaps.
• Modern NSGN sites will feature advanced next-generation NASA SLR and VLBI systems.
• Centralized and automated operations are planned for efficient NSGN management.