| 用时钟方波测试地震数采时间精度及系统特性 |
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| 引用本文： | 谢剑波,袁松湧,叶世山,杨大克,陈建涛,丁莉莎,卢子晋,劳 谦,廖一帆,吕仲杭.用时钟方波测试地震数采时间精度及系统特性[J].大地测量与地球动力学,2018,38(10):1073-1079. |
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| 作者姓名： | 谢剑波 袁松湧 叶世山 杨大克 陈建涛 丁莉莎 卢子晋 劳 谦 廖一帆 吕仲杭 |
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| 摘 要： | 用采集时钟方波信号加以分析的方法评估地震数据采集器的授时、守时服务精度、稳定性及系统特性。将具有时钟误差日志记录的数采的时间精度测试结果与日志记录相比较，二者完全一致；用时钟方波信号实测的数采经验传递函数与用厂家提供的滤波器系数并校正滤波器时间延迟计算的理论频率特性相符。实测结果显示，由于数采守时误差变化呈非线性，即使同一型号的不同数采间，其守时能力也可以差别很大；对于不同的数采及抽取滤波器，由于滤波延迟时间校正的参考点不一致，可导致数采记录数据的时间服务存在1个采样点左右的时间差，这对时间精度要求高的研究工作是不能接受的。
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| 关 键 词： | 地震数采 时间精度 系统特性 时钟脉冲 |
Testing of Seismic Digitizer’s Time Tag Accuracy and System Characteristic Using Timing Pulses |
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| XIE Jianbo,YUAN Songyong,YE Shishan,YANG Dake,CHEN Jiantao,DING Lisha,LU Zijin,LAO Qian,LIAO Yifan,Lu Zhonghang.Testing of Seismic Digitizer’s Time Tag Accuracy and System Characteristic Using Timing Pulses[J].Journal of Geodesy and Geodynamics,2018,38(10):1073-1079. |
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| Authors: | XIE Jianbo YUAN Songyong YE Shishan YANG Dake CHEN Jiantao DING Lisha LU Zijin LAO Qian LIAO Yifan Lu Zhonghang |
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| Abstract: | This paper introduces a method using recorded timing pulses to estimate the time tag accuracy and system characteristic of a seismic digitizer. The estimated time tag accuracy of a digitizer with internal timing error log is consistent with its error log record. The estimated empirical transfer functions in two other experiments are consistent with their frequency responses calculated from FIR filter coefficients provided by the manufacturer,and their filter delay times are compensated. Our experiment’s results show that the non-linearity of time tag accuracy drift without timing synchronization could differ very much between different digitizers, even using the same model; additionally, that there could be about 1 sample point timing difference among different digitizers and different decimation filters due to the inconsistency in their filter delay time compensation. Such timing inconsistency could be unacceptable in work that requires accurate timing service. |
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| Keywords: | seismic digitizer time tag accuracy system characteristic timing pulses |
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