时间服务系统在地球物理场以及其他各种信息的观测记录中是一个重要环节,通常人们总是用钟作为一个相对时间标准,并且经常用收讯机收对天文台的授时信号加以校准,随着科学技术的发展,对于钟也提出了新的要求,不仅要能够计时,还要求具有更广泛的功能,譬如进行时间的自动记录,定时控制,以及从记录上进行时间检索等等。于是,对于一台钟,仅仅给出数字显示和诸如分号、秒号这样的时标,在许多场合已经显得不够了, The time service system is an important link in the observation records of geophysical fields and other various information. People usually use the clock as a relative time standard, and often receive the chronometer signal from the observatory to calibrate it. The development of science and technology has also set new demands on the clock not only to be able to time but also to have more extensive functions, such as automatic recording of time, timing control, and retrieval of time from records. Thus, for a single clock, merely giving a digital display and a time-stamp such as a semicolon or a second is not enough on many occasions,