Research on the Method of Remote Reproduction of UTC(NTSC) and its Realization

National time service center (NTSC) is responsible for the generation, maintenance and dissemination of national standard time in China. It has established national standard time UTC (NTSC) synchronized with UTC, and kept the deviation between UTC (NTSC) and UTC is less than 10 ns. In order to allow more remote users acquired the high precision time and frequency signal traceable to UTC, this paper presents a time comparison method applicable for UTC (NTCS) remote reproduction, the time comparison method proposed herein has achieved UTC (NTSC) remote reproduction system in engineering. It has solved the problem that the method of standard satellite common view exits measuring dead time, and couldn't output real-time comparison results. The paper discuss the principle and implement method for remote high precision reproduction UTC(NTSC) system, in additional, the application requirements, the technology of improve precision, and strategy of enhanced reliability are introduced mainly too. In the case of take high-stability crystal oscillator as the signal source, a recent experiment demonstrated that the time offset of reproduction time is less than 10ns compared with UTC(NTSC), frequency accuracy and hourly stability is better than lE-13 and lE-12 respectively.