Methods to improve the anti-interference ability of seismograph in time service
-
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.
-
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 
下载: 导出CSV
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
下载: 导出CSV
-
[1] 杨金梁,卢勇,柴军兵. GNSS授时原理及其精度分析[J]. 物探装备,2018,28(2):87-90 doi: 10.3969/j.issn.1671-0657.2018.02.005Yang J L,Lu Y,Chai J B. GPS timing and timing accuracy analysis[J]. Quipment for Geophysical Prospecting,2018,28(2):87-90 doi: 10.3969/j.issn.1671-0657.2018.02.005 [2] 刘宏华,陈巧霞,廖有幸. GNSS抗干扰技术的现状与发展[J]. 舰船电子对抗,2014,37(6):44-48 doi: 10.16426/j.cnki.jcdzdk.2014.06.014Liu H H,Chen Q X,Liao Y X. Current situation and development of anti-jamming technology of GNSS[J]. Shipboard Electronic Countermeasure,2014,37(6):44-48 doi: 10.16426/j.cnki.jcdzdk.2014.06.014 [3] 汪汉新. 高速电路PCB板电磁干扰的抑制方法[J]. 中南民族学院学报(自然科学版),2000,20(4):14-17Wang H X. Design of electro-magnetic interference suppresser for the high speed circuit PCB[J]. Journal of South-Central University for Nationalities(Natural Science Edition),2000,20(4):14-17 [4] 孙伟. 电子电路设计的实用技巧研究[J]. 电子元器件与信息技术,2020,4(3):122-123 doi: 10.19772/j.cnki.2096-4455.2020.3.050Sun W. Research on practical techniques of electronic circuit design[J]. Electronic Component and Information Technology,2020,4(3):122-123 doi: 10.19772/j.cnki.2096-4455.2020.3.050 [5] 倪冬兵. 通讯产品电路设计中的电磁波辐射和辐射抗扰性问题研究[J]. 电子质量,2001(4):51-55 doi: 10.3969/j.issn.1003-0107.2001.04.015Ni D B. The study of the problem of the electromagnetic wave radiation and interference in the design of the circuit for the TELECOM products[J]. Electronics Quality,2001(4):51-55 doi: 10.3969/j.issn.1003-0107.2001.04.015 [6] 蔡久评,熊中侃. 电子电路设计的原则、方法和步骤[J]. 江西教育学院学报,2007,28(6):13-16Cai J P,Xiong Z K. Principles,methods & steps of electronic circuit design[J]. Journal of Jiangxi Institute of Education(Comprehensive),2007,28(6):13-16 [7] 郎维川,张文亮. 电磁兼容与抗扰性试验的选择[J]. 高电压技术,1998,24(1):40-42,46 doi: 10.13336/j.1003-6520.hve.1998.01.015Lang W C,Zhang W L. Electromagnetic compatibility and selection of immunity test[J]. High Voltage Engineering,1998,24(1):40-42,46 doi: 10.13336/j.1003-6520.hve.1998.01.015 [8] 陈联青,贾艳芳,顾欣莉. GPS授时(网络)地震仪[J]. 物探装备,2006,16(增刊1):1-7Chen L Q,Jia Y F,Gu X L. GPS clock (network ) seismograph[J]. Quipment for Geophysical Prospecting,2006,16(S1):1-7 [9] 王婷婷,王圣东,陈欣. GPS干扰与抗干扰技术发展现状分析[J]. 指挥控制与仿真,2008,30(6):118-200 doi: 10.3969/j.issn.1673-3819.2008.06.031Wang T T,Wang S D,Chen X. A survey on development of GPS jamming and anti-jamming technology[J]. Command Control & Simulation,2008,30(6):118-200 doi: 10.3969/j.issn.1673-3819.2008.06.031 -
点击查看大图
计量
- 文章访问数: 24
- HTML全文浏览量: 17
- PDF下载量: 1
