GNSS授时原理及其精度分析

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，进而导致地震仪授时不准。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，所用技术可应用于提升地震仪的授时准确度。

GPS timing and timing accuracy analysis

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 time-service 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.