Abstract：To keep UTC(NIM) consistent with UTC, the frequency control volume of the master clock must be consistent with the frequency of TAI. The UTC(NIM) Algorithm is composed of three sub-algorithms, that is the algorithm of the UTC and UTCr, clocks group frequency, and the fountain clock. Principles of these algorithms are introduced and the results are analyzed. The data results of 2013~2015 showed that UTC(NIM) is mainly produced by the algorithm of UTC and UTCr in 2013 and 2014, with the deviation for UTC within ±10 ns, and the time stability 0.68 ns; UTC(NIM) is mainly produced by the algorithm of clocks group frequency in 2015, with the deviation for UTC within ±5 ns, and the time stability 0.27 ns.
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2015, Vol. 36 
