WANG Zheng-ming, QI Yi, CHE Ai-xia

(National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China)

Abstract：As a part of the renovation project of the Long Wave Time and Frequency Broadcasting System (BPL) at the National Time Service Center (NTSC), the software for controlling and monitoring the BPL Time and Frequency system has been developed and described here. The whole software system consists of two parts. One part contains the software which deals with hardware controlling such as time synchronization of each computer to the standard time of the BPL T & F system, time comparison, data gathering, data transfer, micro-phase stepper controlling and telephone alarming. The other part involves all kinds of data processing and analysis. With the results of data processing, the software system can monitor T(PU) and generate the frequency offset for steering T(PU), display curves for devices running status, judge whether the T & F devices working properly and produce the messages of device abnormality, et al. The whole software System has been in test running for nearly one year. After being further modified, the software proves running effectively and properly.　 

Key words：BPL; time and frequency; automatic controlling; software