基于片上可编程系统的可控震源扫描信号研究与设计

摘要

Vibrosesis is of increasingly important value in geological exploration. During the field work, different geological conditions need different parameters, the choice of suitable excitation parameters and the realization of the appropriate sweep signal become important problems. Main numbers of controlled seismic source, start-end frequency, scanning length, scanning slopes and its length in linear sweep signal, pseuda code order and carrier frequency in pseudo sweep signal were analyzed and discussed in this paper, and the influence of these parameters on quality of the sweep signal was studied in detail. The design of IP core of VSG hardware and the signaling system based on SOPC can meet the technical indices of the sweep signal.%在可控震源地震勘探中,不同的地质条件需要设置不同的激发参数,如何选择合适的激发参数并实现相应的扫描信号是必须关注的问题.在分析可控震源的线性扫描的起止频率、扫描长度、扫描斜坡函数和长度参数及伪随机扫描的阶次与载波频率对扫描信号质量的影响后,通过片上可编程系统设计了VSG硬件IP核与信号发生器系统,依据分析的信号选择原则实现了对应扫描信号的产生,达到扫描信号的技术指标.