Postprocessed timescales at the U.S.naval observatory

摘要

A set of free-running timescales is generated using 9 years of data from the USNO clock ensemble. Cesium and maser clock phases and frequencies are characterized by global fits to first- or second-order polynomials, and the timescales are generated from the clocks' detrended frequencies using a variety of weighting functions. These timescales are compared to those generated by USNO's A.1, BIPM's ALGOS and TT98, and NIST's AT1 algorithms from the perspective of algorithm choice and frequency stability.