Joint time scale algorithm of UTC(NTSC) and UTC(SU)

Russian-Chinese Cooperation Committee on Satellite Navigation was established by the two sides of China and Russia under the regular meeting mechanism, In order to effectively pro-mote the cooperation between China and Russia in the field of satellite navigation. The technical communication of existing and future compatibility, interoperability and time system interoperability, etc was established by the committee. UTC(NTSC) and UTC(SU) joint time scale is a unified reference for compatibility and interoperability of GLONASS and BeiDou navigation system. The unified reference is necessary for effectively promoting the cooperation between the two sides in the field of satellite navigation. In this paper, through atomic clock stability analysis, the linear prediction model was used for cesium clocks and the quadratic prediction model was used for hydrogen maser clocks. The weight of clock was determined by the `predictability' of clock. UTC(NTSC) and UTC(SU) joint time scale and the time scale generated using only the NTSC laboratory atomic clocks was calculated from MJD 57754 to 58119. The results shows that the stability of the joint time scale is better than the stability of the time scale calculated using only the NTSC laboratory atomic clock.