NASA has activated a new laser technology aboard the GPS III SV-09 satellite, launched January 27, that will significantly enhance the accuracy of Global Positioning System data for users worldwide. The instrument, a laser retroreflector array or LRA, functions by precisely reflecting laser beams back to their source, allowing for the measurement of satellite distance with greater precision. This advancement will improve the tie between GPS and the global coordinate system, resulting in more reliable location and navigation information for applications ranging from everyday travel to critical Earth observation missions. “LRAs are the most efficient and cost-effective way to improve products that come out of GPS,” said Lucia Tsaoussi, program manager for NASA’s Space Geodesy at NASA Headquarters in Washington. Stephen Merkowitz, project manager for the Space Geodesy Project at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, added that most people don’t realize they’re relying on these kinds of measurements every day.
GPS III SV-09 Satellite Integrates Laser Retroreflector Array
A single satellite launched in January has enhanced the precision of a technology billions rely on daily; the GPS III SV-09 satellite now carries an operational laser retroreflector array, or LRA, as of March 9, and it will refine global positioning accuracy. These LRAs, comprised of cube-corner mirrors, function by reflecting laser beams directly back to their origin, enabling highly accurate distance measurements through laser ranging, a technique that calculates distance based on light travel time. The satellite was launched via a SpaceX Falcon 9 rocket from Space Launch Complex 40 at Cape Canaveral Space Force Station in Florida, integrating this crucial technology into the U.S. Space Force’s Block III Global Positioning System. This improvement extends beyond personal navigation, directly impacting the accuracy of data collected by other Earth-observing satellites like ICESat-2, SWOT, and GRACE-FO, all of which utilize laser-ranging for precise orbital positioning. International stations will join the monitoring effort, further solidifying the enhanced accuracy provided by this integration.
Space Geodesy Network Tracks Precise Satellite Positioning
This laser ranging technique measures distance by calculating the round-trip time of light pulses, providing a crucial refinement to satellite positioning beyond standard radio-wave methods; the instrument was operational as of March 9, marking a significant step in bolstering navigational accuracy for a wide range of applications. Lucia Tsaoussi explained that the more precise the GPS orbit information, the more accurate and reliable the rest of the satellite’s data becomes, improving our understanding of the planet and enhancing early warnings for natural hazards. Currently, a global network of Satellite Laser Ranging stations operated by NASA’s Space Geodesy Project is monitoring the GPS III SV-09 satellite, and the agency anticipates the inclusion of additional international stations to further solidify the network’s capabilities and data validation. These LRAs were jointly developed with the Naval Research Laboratory’s Naval Center for Space Technology in Washington, demonstrating a collaborative approach to advancing space-based geodesy and its benefits for global positioning systems.
LRAs are the most efficient and cost-effective way to improve products that come out of GPS.
Lucia Tsaoussi, program manager for NASA’s Space Geodesy at NASA Headquarters in Washington