用铷原子钟对PC进行时间校准及其误差分析

Calibrating time of PC by a Rubidium Clock and Its Error Analysis

个人计算机(以下简称PC)的系统时间由其自带的RTC晶振提供,其时间频率准确度并不高。为此,综合考虑各种方案,采用外部校准时间的方法提高PC时间的准确度。通过时间间隔测量的方法获得了作为校准时间结果的钟差值,并对实验结果做了详细分析。测试结果表明,PC与铷钟同步标准偏差小于1ms。经过时间校准后的PC可以作为网络时间服务器。

The Personal computer （PC） system time is provided by the RTC oscillator. Its time frequency accuracy is not high. Many methods are compared and a time calibration method is used to improve the accuracy of PC time by a external clock. A measurement method to get the clock offset is designed by a time interval counter and the test results are analyzed in detail. The test results indicate that the standard deviation of synchronization error between the PC and the rubidium clock is less than 1 ms. After time calibration, the PC can be used as a network time server.