Application Of FPGA In Ground Multi-function Electromagnetic Detection System

Mineral resources are indispensable energy for modern scientific and technological progress and industrial development.Geophysical exploration method is one of the most effective methods to find underground mineral resources.At present,the most widely used geophysical exploration method is electrical exploration.Common methods include magnetotelluric sounding method,controllable source audio-frequency magnetotelluric method,etc.However,a single electrical exploration method has its own corresponding advantages and disadvantages,and there are limitations in practical applications.Therefore,the research to integrate a variety of electrical exploration methods into a detection system can not only improve the efficiency of field construction operations and electrical exploration,but also improve the reliability of later data processing.This thesis mainly studies the research and development of multi-method joint exploration instruments and equipment in electrical exploration,and focuses on the application of programmable logic devices such as FPGA and CPLD in ground multifunctional electromagnetic detection systems.The use of programmable logic devices has strong computing power,The advantages of fast processing speed can improve the control ability,logic operation ability,and data processing ability of the detection system.After in-depth investigation of the research status of related instruments at home and abroad,the overall design plan of the detection system in this design is proposed,and the related Software and hardware design and functional testing.The hardware circuit design adopts the method of sub-module,which mainly includes frontend analog acquisition board,digital main control board,clock board,power management circuit board and other external interface circuit boards to realize electromagnetic field signal acquisition,analog-to-digital conversion processing,and detection system main Control and logic control,high-precision synchronous clock generation,power monitoring and management,and humancomputer interaction.Among them,the acquisition board,power management circuit board,interface board,etc.are all based on laboratory research foundation.This thesis focuses on the digital main control circuit board based on FPGA+ARM architecture as the main control and the clock circuit board based on GPS+OCXO synchronous clock scheme.The software program design is based on the Verilog HDL hardware description language to complete the related design.Among them,the clock board program is in the Quartus Prime development environment to realize the design of the clock synchronization program in the main control CPLD,and the digital main control board program is in the ISE 14.7 development environment Complete the FPGA internal timing logic design and development,the specific functions implemented mainly include: FPGA and ARM data interaction and analysis,detection system task scheduling and control of different electromagnetic exploration methods,ground electromagnetic data collection and related preprocessing,GPS data reception and analysis,etc.After many verifications and improvements of the design scheme,the software and hardware implementation of the clock board and digital main control board in the ground multi-functional electromagnetic detection system was successfully completed.After several board-level debugging in the room,field related tests were carried out.,The results show that the various functions of the detection system are working properly.Finally,it summarizes the work done in the full text,and puts forward suggestions for the imperfect parts of the detection system and follow-up work.