Abstract
Abstract. In the past few decades, with the continuous advancement of technology, seismic and electrical instruments have developed rapidly. However, complex and harsh exploration environments led to higher requirements and severe challenges for traditional geophysical exploration methods and instruments. Therefore, it is extremely urgent to develop new high-precision exploration instruments and data acquisition systems. In this study, a new distributed seismic and electrical hybrid acquisition station is developed using system-on-a-programmable-chip (SoPC) technology. The acquisition station hardware includes an analog board and a main control board. The analog board uses a signal conditioning circuit and a 24-bit analog-to-digital converter (ADS1271) to achieve high-precision data acquisition, while the main control board uses a low-power SoPC to enable high-speed stable data transmission. We designed the data transmission protocol for the acquisition station and developed independently an improved low-voltage differential signaling data transmission technology. What's more, a method to enhance the precision of synchronous acquisition was studied in depth. These key technologies, which were developed for the acquisition station, were integrated into the SoPC of the main control board. Test results indicate that the synchronization precision of the acquisition station is better than 200 ns, and the maximum low-power data transmission speed is 16 Mbps along a 55 m cable. The developed acquisition station has the advantages of low noise, large dynamic range, low power consumption, etc., and it can achieve high-precision hybrid acquisition of seismic and electrical data.
Highlights
Geophysics is a discipline in which physics principles, methods, and instruments are applied to research and understanding of the Earth structures
The Institute of Geology and Geophysics of the Chinese Academy of Sciences has designed, based on a computer network, a digital seismic acquisition system with low power consumption that is capable of data transmission through thousands of channels
The data can be further filtered by the digital filter and synchronized with a high precision; it is transmitted to the corresponding power station using Manchester encoding and custom data transmission protocols, as well as the independently developed low-voltage differential signaling (LVDS) low-power data transmission technology
Summary
Geophysics is a discipline in which physics principles, methods, and instruments are applied to research and understanding of the Earth structures It plays an important role in the exploration of energy and mineral resources (Liu, 2017). The Institute of Geology and Geophysics of the Chinese Academy of Sciences has designed, based on a computer network, a digital seismic acquisition system with low power consumption that is capable of data transmission through thousands of channels. Electrical exploration has been rapidly developed and adopted in mineral resource prospecting, engineering surveys, and environmental surveys These techniques are not sufficient to research the fine ground structures because of limitations in vertical resolution of electrical exploration. The development of a new seismic and electrical hybrid acquisition station is of great significance for improving the level of geophysical equipment and promoting the development of combined seismic and electrical exploration technology
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