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Two-way satellite time and frequency transfer(TWSTFT) has been recognized as one of the most accurate means for remote clock comparisons. The advantage is that the symmetry of the signal paths of two earth stations makes the errors to be mostly canceled. In two-way links, it is found that there are diurnal variety error whose magnitude is 1–3ns in most TWSTFT results. Combined with the character of...
Hydrogen masers and cesium clocks are two important kinds of precision frequency standard, and each of them has its own advantages in time keeping. It is important to investigate the way for effectively combining these two kinds of cocks in order to form a better atomic time scale. There are four hydrogen masers and eighteen Hp5071A cesium clocks at NTSC (National Time Service Center, the Chinese...
The paper introduces the microwave time transfer system between timekeeping laboratory in Lintong and time & frequency control laboratory in Pucheng of National Time Service Center. The distance between timekeeping laboratory and time & frequency control laboratory is about 71 km. The microwave time transfer system was reconstructed in 2007, in order to transfer time signal more precisely,...
The advantage of a hydrogen maser is in its short-term stability, however, with the same hydrogen masers, their performance are different. In 2004, four hydrogen masers were bought to time keeping laboratory of NTSC, two of which were made in USA, and the other two in China. In order to make full use of the hydrogen masers, it is necessary to study their performance which includes the short-term stability,...
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