﻿ 一种低采样数据采集设备时间精度的测量方法
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 大地测量与地球动力学  2024, Vol. 44 Issue (2): 217-220  DOI: 10.14075/j.jgg.2023.04.187

### 引用本文

ZHENG Shumei, ZHAO Lijun, LI Wenyi, et al. A Time Accuracy Measurement Method for Low-Sampling Data Acquisition Equipment[J]. Journal of Geodesy and Geodynamics, 2024, 44(2): 217-220.

### Foundation support

The Spark Program of Earthquake Technology of CEA, No. XH21052Y, XH22017YA, XH22018YA, XH23058A; Science and Technology Innovation Director Fund of the First Monitoring and Application Center, CEA, No. FMC202311.

### 第一作者简介

ZHENG Shumei, PhD, engineer, majors in seismic metrology, E-mail: zhengshumei0216@163.com.

### 文章历史

1. 中国地震局第一监测中心，天津市耐火路7号，300180

1 测量原理与方法

 $e(t)=E \sin \left(2 \pi f_0 t+\varphi_0\right)+d_0$ (1)

 $t_i=\Delta t_i i=\frac{i}{f_L}, i=1, 2, \cdots, n$ (2)

 $t_j=\Delta t_j j=\frac{j}{f_H}, j=1, 2, \cdots, m$ (3)

 $\begin{gathered} a_L\left(t_i\right)=A_L \sin \left(2 \pi f_0 t_i+\varphi_L\right)+d_L= \\ A_L \sin \left(\omega_L i+\varphi_L\right)+d_L \end{gathered}$ (4)

 $t_{0 L}=\varphi_L / 2 \pi f_0$ (5)

 $\begin{gathered} a_H\left(t_j\right)=A_H \sin \left(2 \pi f_0 t_j+\varphi_H\right)+d_H= \\ A_H \sin \left(\omega_H j+\varphi_H\right)+d_H \end{gathered}z$ (6)

 $t_{0 H}=\varphi_H / 2 \pi f_0$ (7)

 $\tau_L=t_{0 L}-t_{0 H}-\tau_0=\frac{\varphi_L-\varphi_H}{2 \pi f_0}-\tau_0$ (8)
2 数据获取

3 仿真验证与实例应用 3.1 仿真实验验证

 图 1 仿真波形 Fig. 1 Simulation waveform

 图 2 仿真实验频率特性 Fig. 2 Frequency characteristics of simulation experiments
3.2 实例应用

 图 3 地震数据采集器24 h的GPS授时时间同步误差 Fig. 3 24 h GPS time synchronization error of seismic data collector

 图 4 数采20 min数据波形 Fig. 4 Data acquisition for 20 min data waveform

 图 5 实例频率特性 Fig. 5 Instance frequency characteristics

4 结语

 [1] 中国地震局. 地震观测仪器进网技术要求: 地震仪DB/T 22-2020[S]. 北京: 地震出版社, 2020 (China Earthquake Administration. Technical Requirements of Instruments in Network for Earthquake Monitoring —Seismograph. DB/T 22-2020[S]. Beijing: Seismological Press, 2020) (0) [2] Kromer R P. Ground-Based Monitoring R and E Technology Report: Evaluation of the Kinemetrics/Quanterra Q330HR Remote Seismic System for IRIS/GSN[R]. Sandia National Laboratories, New Mexico, 2006 (0) [3] Kromer R P. Ground-Based Monitoring R and E Technology Report: Evaluation of the Refraction Technology RT130HR Remote Seismic System for IRIS/GSN[R]. Sandia National Laboratories, New Mexico, 2006 (0) [4] Merchant B J, Hart D M. Component Evaluation Testing and Analysis Algorithms[R]. Sandia National Laboratories, New Mexico, 2011 (0) [5] 梁志国. 通道间延迟时间差的测量不确定度[J]. 计量学报, 2005(4): 354-359 (Liang Zhiguo. The Measurement Uncertainty of Delay between Channels[J]. Acta Metrologica Sinica, 2005(4): 354-359) (0)
A Time Accuracy Measurement Method for Low-Sampling Data Acquisition Equipment
ZHENG Shumei1     ZHAO Lijun1     LI Wenyi1     TANG Rong1     DENG Dongjian1     MING Xiaoran1     SHENG Didi1
1. The First Monitoring and Application Center, CEA, 7 Naihuo Road, Tianjin 300180, China
Abstract: We propose a time accuracy measurement method for low-sampling data acquisition equipment. We introduce the measurement principle and data acquisition process of this method, and give results of the time accuracy for a low-sampling data collector equipment with an example of earthquake department. The results show that this method can improve the time measurement accuracy of low-sampling data acquisition equipment to milliseconds. This method can be used in the test of timing accuracy of geophysical observation data collector with linear relationship between input and output.
Key words: low sampling; data acquisition equipment; time accuracy; geophysical observation data collector