那曲台阵GPS授时状况分析

THE ANALYSIS OF NAQU ARRAY GPS TIMING

分析那曲台阵自2007年底建成以来到2014年3月的数据,对其数据完整率进行初步统计,并通过选取记录到的地震事件的P波到时与理论到时的误差来判断那曲台阵各子台GPS授时情况。通过分析表明,那曲台阵的系统数据连续率不到50%,各子台GPS授时在刚建台的一年左右时间里稳定正确,后续一段时间偏差比较大,整体数据的可用性不高。

This article has conduct a rough evaluation on the continuity of the data collected from Naqu Array from December, 2007 to March, 2014 and analyzes the GPS timing of Naqu Array by comparing the deviation between the arrival time of P wave and the theoretical arrival time of P wave of the recorded earthquake. According to the analysis, the continuity ratio of Naqu array is less than 50%. In addition, the GPS timing of each sub-station was stable and correct during the first year after its establishment, however, the deviation become larger in the following year. Consequently, the data is not reliable for research,