time tagging
集中绝对时标 centralized absolute chronology
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以GPS系统实时时钟为基础，通过对绝对时标加以处理，以无线方式实现了不同站点之间的实时数据采集。
Based on real time clock of GPS system, and by means of absolute time-marker, real time data acquisition between different sites was performed in the form of wireless.
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