Time and Frequency Activities at the U.S. Naval Observatory
Figure 6
The precision of GPS Time and of
GPS’s delivered prediction of
UTC(USNO), using TTR-12 data since
12JUL02, measured by the attainable external precision (RMS, mean not removed)
as a function of averaging time, and referenced to UTC(USNO). Improved performance in accessing UTC(USNO)
could be realized if only the most recently updated navigation messages are
used. The accuracy attainable over a given averaging time also depends upon the
calibration of the user’s receivers.
