用于海洋地震勘探系统的数据变采样率采集及自检控制模块

A Sampling Rate Adjustment and Self-Check Control Module Based on Marine Seismic Exploration System

针对传统海洋地震勘探系统的不足之处,本文提出了一种用于海洋地震勘探系统的数据变采样率采集及自检控制模块。该模块采用一种基于锁相环的变采样率采集节点同步设计方法,实现了采样率可调节的数据采集功能,同时,该模块还实现了基于奇、偶通道控制模块的自检功能,完成了变道数采集以及系统自检测。试验现场的测试结果表明,系统的同步精度为4.86 ns,可灵活实现海洋地震勘探系统4 ksample/s(sample per second,每秒采样次数)、2 ksample/s、1 ksample/s、500 sample/s、250 sample/s 5种采样率可调的功能,同时能够进行包括奇、偶通道串扰,通道一致性,谐波失真,噪声、直流偏置六项系统自检功能,从而验证了本文所提出的海洋地震勘探系统的可行性。

In order to overcome the shortcomings of the existing system,a sampling rate adjustment and self-checkcontrol module based on marine seismic exploration system is presented in this paper. The module uses a method ofvariable sampling rate acquisition node synchronization based on phase-locked loop,to achieve the function of adjust-able sampling rate data acquisition. Meanwhile,the self-check function based on a control module of odd and evenchannels is developed,and variable channel acquisition as well as system self-check is accomplished. The results ofexperiments verify the feasibility of the proposed marine seismic exploration system. It shows that the synchronizationaccuracy of proposed system was 4.86 ns. The function of adjustable sampling rate includes five modes（4 ksample/s（sample per second）,2 ksample/s,1 ksample/s,500 sample/s and 250 sample/s）. And the function of self-check in-cludes six modes（odd or even channel crosstalk,channel consistency,harmonic distortion,DC bias and noise）.