Methods to improve the anti-interference ability of seismograph in time service
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摘要: 地震仪授时的准确程度直接影响地震定位能力。目前地震仪均采用卫星定位导航系统进行卫星授时。地震仪中的授时模块易受射频干扰，进而导致地震仪守时不准。研究认为高频元件、电源模块、线路设计及地线部署是产生射频干扰的主要原因。本文在实验的基础上发现，增设隔离板、替换元件、优化线路设计及调整地线部署可以稳定地降低地震仪系统对授时模块的电磁干扰，所用技术可用于提升地震仪的授时准确度。Abstract: The timing accuracy for seismographs directly affects the seismic location ability. At present, seismographs usually use satellite positioning and navigation system for timing service. The time-service module of the seismograph is susceptible to radio frequency interference, which leads to inaccurate punctuality of the seismograph. The main causes of electro-magnetic interference are high-frequency electronic components, power supply modules, circuit design and ground wire deployment. Based on the experiments, it is found that the electromagnetic interference of the seismograph system to the timing module can be stably reduced by adding an isolation plate, replacing components, optimizing the circuit design and adjusting the arrangement of ground wires. The techniques mentioned in this pater can be used to improve the timing accuracy of the seismograph.
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图 1 地震仪授时干扰源及解决方法示意图
Figure 1. Time service interference source of seismograph and its solution
图 3 针对授时模块未采取本文所述抗扰技术前的幅频曲线
Figure 3. Amplitude-frequency curve for a seismograph without anti-disturbance techniques mentioned in this paper for the time service module
图 4 射频电路安装屏蔽板前（a）后（b）
Figure 4. RF circuit without shield board (a) and with (b) shield board
图 8 授时模块抗干扰改进后的野外测试及结果
Figure 8. Field test and wave recording after modification with anti-disturbance techniques for the time service module
表 1 屏蔽罩安装效果对比数据
Table 1. Comparison data of shield board installation effect
观测频点/
Ghz未安装屏蔽板的峰值/
dBuV已安装屏蔽板的峰值/
dBuV1.570166 53.96 43.62 1.580333 49.26 40.39 1.564916 47.61 39.48 1.575333 46.21 38.08 
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表 2 整改前后对比数据
Table 2. Comparison data before and after rectification
卫星
编号整改以前卫星信号的
信噪比/dB整改之后卫星信号的
信噪比/dBG1 31 41 G7 32 42 G8 17 29 G9 29 39 G17 25 36 G19 22 33 G21 31 37 G30 30 40
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