The National Aeronautics and Space Administration (NASA) has announced an opportunity for participation in the Crustal Dynamics Research Program for the analysis and interpretation of geodetic data acquired by NASA's Crustal Dynamics Project through space techniques.
These techniques include laser ranging to artificial satellites and the moon (SLR and LLR) and very long baseline interferometry (VLBI), which uses radio signals emitted by celestial sources. Fixed stations are used, as well as highly mobile stations capable of being moved from site to site in the United States and of being transported to overseas areas. The measurements will be used to determine the positions of the observing sites as a function of time, baseline lengths and baseline directions between stations as a function of time, and measurements of polar motion and earth rotation. The techniques are capable of precisions of a few centimeters over baselines of up to several thousands of kilometers and baseline length changes of 1 cm/yr or better.