New NASA technology to better measure Earth's orientation

​Washington: The US space agency has deployed an advanced technology to precisely measure Earth's orientation and rotation- information that helps provide a foundation for navigation of all space missions and for geophysical studies of our planet.

The technology includes a new class of radio antenna and electronics that provide broadband capabilities for Very Long Baseline Interferometry (VLBI). This technique has been used to make precise measurements of the Earth in space and time. To meet the demand for more precise measurements, a new global network of stations called the VLBI Global Observing System (VGOS) is being rolled out to replace the legacy network.

NASA just completed the installation of a joint NASA-US Naval Observatory VGOS station in Hawaii. NASA has two other developmental VGOS stations operating at NASA's Goddard Space Flight Centre in Greenbelt, Maryland, and at the Massachusetts Institute of Technology's Haystack Observatory in Westford, Massachusetts.

With this preliminary network, NASA recently conducted the first demonstration anywhere in the world of broadband observations for VLBI over a long baseline. "The successful tests demonstrate the viability of the new broadband antenna technology for making the kinds of observations needed for improved accuracy in measurements of the very fine-scale shape of Earth," said Benjamin R. Phillips, who leads NASA's Earth Surface and Interior Focus Area.