一种高精度地震数据采集单元的系统设计与实现

发布时间：2018-03-26 19:11

  本文选题：地震数据采集　切入点：CPLD　出处：《地球物理学进展》2017年04期

【摘要】：随着国民经济的发展,矿产资源的勘探迫在眉睫.金属矿地表地质和地下地质的特殊性,勘探具有勘探深度大、分辨率高等特点,常规地震勘探技术不适用于金属矿勘探.因此,必须研制轻便、低成本的高精度地震仪器.而地震数据的采集是地震勘探的重要技术环节,采集单元的技术指标对野外采集的质量至关重要,而数据采集单元的指标高低,绝大部分取决于模数转换单元的选取,因此,本文重点对模数转换单元进行了设计,采用高精度的24位Σ-Δ型ADC进行数据的采集,在分辨率和动态范围上都有了突破,然后采用基于CPLD的数字逻辑设计方式对地震数据进行处理,在硬件方面成功的降低了该采集站电路设计的硬件规模,降低了成本和功耗,然后通过RS-485的数据传输方式进行远程传输,从而将采集数据传送到PC主机.与此同时,在硬件方面,也对整个电路的规模进行了系统优化,并进行了实验仿真,验证了逻辑功能的正确性,增强了系统的可靠性.
[Abstract]:With the development of national economy, the exploration of mineral resources is imminent. Because of the particularity of surface geology and underground geology, the exploration has the characteristics of large exploration depth and high resolution. Conventional seismic exploration technology is not suitable for metal ore exploration. Therefore, it is necessary to develop portable, low-cost and high-precision seismograph, and seismic data acquisition is an important technical link in seismic exploration. The technical index of the acquisition unit is very important to the quality of the field acquisition, and the level of the data acquisition unit mostly depends on the selection of the analog-to-digital conversion unit. Therefore, this paper focuses on the design of the analog-to-digital conversion unit. High-precision 24-bit 危-螖 ADC is used for data acquisition, which has a breakthrough in resolution and dynamic range. Then the seismic data are processed by digital logic design method based on CPLD. In the aspect of hardware, the hardware scale of the circuit design of the acquisition station is reduced, and the cost and power consumption are reduced. Then the data is transmitted remotely through RS-485, and then the data is transmitted to the PC host computer. In the aspect of hardware, the scale of the whole circuit is optimized, and the simulation is carried out, which verifies the correctness of the logic function and enhances the reliability of the system.
【作者单位】： 中国科学院地质与地球物理研究所中国科学院油气资源研究重点实验室;中国电建集团北京勘测设计研究院有限公司;北京中科联衡科技有限公司;
【基金】：国家重大科研装备研制项目(ZDYZ2012-1)资助
【分类号】：P631.4
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本文编号：1669205