Research And Design On Microseism Monitoring Acquisition Station Based On FPGA

With the rapid development of electronic technology in modern society, geophysical exploration techniques has been improving. At the same time, the disasters, brought by microseismic movement in the mining process, have gradually become an important topic in geography. In terms of microseismic, harm has seriously affected the property of persons and the security of state, the fundamental path to solve this problem is to enhance the development ability of our country’s independent microseismic monitoring system, it is an urgent requirement that developing a set of new generation of high-precision microseismic acquisition station with independent property rights in mining industry. Microseismic monitoring instrument is the core equipment in the process of microseismic signal acquisition, independent researchment in the microseismic monitoring acquisition station will have a very important practical significance.Microseismic monitoring acquisition station system consists of microseismic signal acquisition and remote transmission. System design applied high-speed, high-density, design flexibility and other characteristics of field programmable gate array. FPGA is the main controller of the entire system. It realizes the ADS1274ADC sampling control, and converts the analog signal which is generated from filtering and amplification into digital signals. The digital signal is transmitted to a PC through the ethernet. We customized hard-cores and soft-cores systems in the design, In the Code section, we use Verilog HDL language and C language in a combination way, and top-down design approach. The FPGA entire logic functions are implemented by the sub-module.The system reflects advanced and innovative in several aspects, such as signal amplification configurability achieved by programmable operational amplifier, the configuration of sampling channels, sampling rate and sampling interval achieved by the utilization of high-precision24bits Δ-Σ ADC in the acquisition process. And the system design effectively improves the applicability, the resolution and dynamic range of data collection. In addition, the usage of Ethernet transmission reduces the distortion rate and bit error rate, and implements a remote transmission of high speed, high efficiency. FPGA-based digital logic design, not only reduces the size of the circuit design in hardware, but also is easier to simulate and debug in software.In the last, the article performed a simulation on each functional module, actually verified the Ethernet data transmission, and completed functional testing of the entire system. The research has a guiding theory and practical application significance for the development of the domestic microseismic acquisition system.