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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.
With the development of the national economy, exploration of mineral resources is imminent.Metal mineral surface geology and underground geology are special, exploration has the characteristics of large exploration depth and high resolution, and conventional seismic exploration technology is not suitable for metal ore exploration.Therefore, it is necessary to develop Lightweight and low-cost high-precision seismic instruments.Seismic data acquisition is an important technology of seismic exploration, the technical indicators of the acquisition unit is essential for the quality of field acquisition, and data acquisition unit indicators, the vast majority depends on Therefore, this article focuses on the analog-digital conversion unit has been designed using high-precision 24-bit Σ-Δ ADC for data acquisition, both in resolution and dynamic range have been a breakthrough, and then use CPLD-based digital logic design approach to seismic data processing, the hardware successfully reduced the hardware design of the acquisition station circuit, reducing costs and power consumption, and then through the RS-485 data transmission for remote transmission, thus The acquisition of data sent to the PC host.At the same time, in terms of hardware, but also the size of the entire circuit system optimization and The line simulation experiments verify the correctness of logic functions, enhanced system reliability.