卫星双向时间与频率传递链接

Two Way Satellite Time and Frequency Transfer Link

时间同步是高精度授时不可或缺的环节。利用同步卫星进行双向时间传递可最大限度地消除路径因素对时间同步的影响,并且可准确、实时地得到高精度的比对结果。国际权度局(BIPM)为改善世界范围内时间同步,提出了全球卫星双向时间传递(TWSTT)计划。德国技术物理研究所(PTB)是国际原子时TAI系统全球时间链接的中心,中国科学院国家授时中心(NTSC)与德国技术物理研究院(PTB)建立了双向比对链。将会进一步提高我国标准时间UTC(NTSC)与国际标准时间比对的性能指标。

Time synchronization is very important to high precise time service. In radio links to transfer time,the signal delays are changing with distance. To use Two-way Time Transfer via geostationary satellites can cancel those influence for the most part. In order to establish real international atomic time scale with high precision and to improve time synchronization on worldwide,BIPM propose the project of global time comparison via TWSTT. PTB is the center of the time links who service for International Atomic Time. The TWSTFT project between NTSC and PTB has processed. The time transfer capability of Chinese standard time UTC(NTSC) will be improved in the world.