Experimental evidence of the ether-dragging hypothesis in GPS data
  In the global positioning system (GPS) satellites, the earth-centered, earth-fixed (ECEF) reference frame is used for calculations. In the application of the theory of special relativity to GPS satellites, one must use the ECEF reference frame; another reference frame, for example one based on the solar system, cannot be applied to GPS satellite experiments. Therefore, the ECEF reference frame is a stationary gravitational frame. 
Masanori Sato