NASA helps maintain International Terrestrial Reference Frame with GNSS

February 29, 2016By
Sites around the world (yellow dots) contributed data and serve as “landmarks along a trail” for the newest update to a global standard called the International Terrestrial Reference Frame. Each site conducts precision measurements using at least 1 and up to 4 geodetic techniques.
Credits: NASA/Earth Observatory/Goddard

News courtesy of NASA / Goddard Space Flight Center The surface of Earth is constantly being reshaped by earthquakes, volcanic eruptions, landslides, floods, changes in sea levels and ice sheets and other processes. Since some of these changes amount to only millimeters per year, scientists must make very precise measurements of the landscape and ocean in space and time in... read more

Expert Advice: Laser Reflectors to Ride on Board GPS III

September 1, 2013By
Figure 2. Structure and products of the Global Geodetic Observing System related to GPS performance.

By James J. Miller and John LaBrecque, NASA Headquarters, and A.J. Oria, Overlook Systems Technologies, Inc. Satellite laser ranging (SLR) and the results of combining SLR with GPS in the future will translate into significant performance advancements for generations to come, once it is fully implemented as part of the GPS III architecture. Simply put, SLR techniques will improve GPS... read more

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