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Development for the Software of Joint Atomic Time of China Computation

Author: LiBian
Tutor: WangZhengMing
School: Graduate School , Chinese Academy of Sciences ( National Time Service Center )
Course: Astrometry and celestial mechanics
Keywords: time scale algorithm GPS CV TWSTFT UTC(JATC)
CLC: P127.1
Type: Master's thesis
Year: 2005
Downloads: 145
Quote: 3
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Abstract


The time scale UTC(NTSC), which is used the standard time in various fields reference directly or indirectly in China, is generated and kept by the National Time Service Center (NTSC), the Chinese Academy of Sciences. The accuracy of UTC(NTSC) to UTC has come up to what the ITU recommended, namely |UTC-UTC(k)|<100ns, since the year 2000. In order to further improve the accuracy and stability of UTC(NTSC), the project for re-establishing the system of Joint Atomic Time of China, which was first established in later 1980s, has been put forward. The system will be consist of as many atomic clocks with high performance as possible which are owned by different units in China.The main contributions of author’s work are as follows:1. Research on the data processing for high precision time comparison between remote clocks, which includes the methods of filtering the random noise from the observed data, the corrections of time delay errors caused by GPS satellite broadcasting ephemeris and Ionospheric refraction and so on.It is necessary to build a network which implements the high precision time comparison between remote clocks. In the system of JATC , we mainly use GPS Common View(CV) multi-channel time transfer receivers to establish a network of GPS CV time comparison. For some participating sites equipped with two-way equipment, the two techniques, GPS CV and TWSTT, are both adopted to realize the time comparison.2. Development for the data processing software of JATC. The software is madeup of the programs of data pre-processing , everyday calculating UTC(JATC)-TA(JATC) and every month calculating UTC-UTC(JATC), TA(JATC)-Clock and so on. The pre-processing program analyses and corrects GPS data which are in question. The results, UTC(JATC)-TA(JATC), of the everyday calculating program which computes GPS CV data and clock data are used to monitor UTC(JATC) in real time. Because TA(JATC) algorithm is being under studying, we adopted ALGOS algorithm temporarily. The software of TA(JATC) calculation has been developed on the Windows 2000 environment with Visual Basic 6.0 language. The data of NTSC in January, 2005 has been computed by this software. The results indicated this software is reliable and correct.

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CLC: > Astronomy,Earth Sciences > Astronomy > Astrometry > Timing, the change of latitude and longitude > Time service
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