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矿井节点式地震仪的时间同步系统包括授时和守时2部分。授时部分为一台基于STM32的可视化手持式低功耗GPS授时仪,实现各台站之间的时间同步;守时部分利用低功耗高精度数字温度补偿晶振电路来实现,以保证各台站相同的时间尺度;在各个台站之间时间同步的前提下,实现了低功耗设计的目标。通过室内实验测试:在地震仪最高采样率4 000 sps的条件下各台站之间的同步误差小于250μs,实际功耗仅0.68 W。
Time synchronization system of mine node seismograph includes timing and punctuality 2 parts. Time-based part of a based on the STM32-based visual handheld low-power GPS timing instrument to achieve the time synchronization between stations; punctual part of the use of low-power high-precision digital temperature compensation crystal oscillator circuit to ensure that each station The same time scale; under the premise of time synchronization among stations, the goal of low power consumption design is achieved. Through the laboratory test: the synchronization error between stations is less than 250μs under the maximum sampling rate of 4 000 sps, the actual power consumption is only 0.68 W.