地震数据采集系统相位特性与测试方法

Phase properties of and testing method for seismic data acquisition system

(1.长江大学电信学院，湖北荆州434023；2.CNPC东方地球物理公司，河北涿州072751)

Electronics & Information College, Yangtze University, Jingzhou 434023, China

相位特性是地震数据采集系统的重要性能指标，直接影响地震数据采集的质量，是地震数据采集系统必须考核的指标之一。对地震数据采集系统中普遍使用的线性相位和最小相位两种滤波器的相位特性进行了讨论，在此基础上，从系统的频率特性出发，给出了相位误差的定义和测试原理；基于模拟信号数字处理技术推导了相位误差的频率域计算公式；详细介绍了采用方波脉冲信号测量相位误差的方法。

Phase properties are an important performance index for seismic data acquisition system and directly impact the quality of acquired data. So it is one of the indexes to be checked in seismic data acquisition system. The phase characteristics of linear phase filter and minimum phase filter commonly used in seismic data acquisition system were discussed. Based on the discussion, the definition and testing principles of phase error were given from the frequency characteristic of system. In addition, the computation formula of phase error in frequency domain was deduced based on the analog signal digital processing technology. Finally, the phase error measuring method by applying square wave signal was detailed described.