The Research of Traceability of CAPS System Time

摘要：

Chinese Area Positioning System (abbreviated as CAPS) has its own special system time called CAPST (China Area Positioning System time). To realize the function of time service, CAPST must be precisely traceable to UTC(NTSC). The very important process when CAPS is to be traced to UTC (NTSC) is that the transmission delay of one pulse per second (lpps) though phase stable cable from the UTC (NTSC) to CAPS time system must be determined. According to the characteristic that rubidium clock is good in shortterm stability but bad in long-term drift rate, the method moving clock out and home is researched and adopted to precisely measure the clock difference between CAPST and UTC (NTSC). According to this clock difference data and the realtime clock difference comparison data acquired from the running CAPS time comparison system, the transmission delay is calculated and it is the crucial data for the traceability of CAPST to UTC (NTSC). Then, the transmission delay subtracted from the real-time clock difference comparison data gives the real-time clock difference between CAPST and UTC (NTSC). That is, CAPST is precisely traced to UTC (NTSC). This campaign is vital to realize CAPS time service function.

关键词： CAPS System time Traceability Moving clock Transmission delay

作者: Huijun Zhang Xiaohui Li Danni Wang

作者单位: National Time Service Center,Chinese Academy of Sciences,Xian 710600,China Key Laboratory of Precis National Time Service Center,Chinese Academy of Sciences,Xian 710600,China Key Laboratory of Precis National Time Service Center,Chinese Academy of Sciences,Xian 710600,China

会议类型: 国际会议

会议名称: 2009 9th International Conference on Electronic Measurement & Instruments(第九届电子测量与仪器国际会议 ICEMI2009)

会议地点: 北京

会议语种:英文

页码: 2514-2517

在线出版日期: 2009-08-16（万方平台首次上网日期，不代表论文的发表时间）