| Seismic exploration system is a kind of large equipment for deep geological exploration.The power station is one of the important parts of the system.The power station design involves the key issues of power protection,power isolation,power monitoring,communication,impedance matching,data processing and acquisition station management.Solving these core technical problems of the power station design can promote the development of seismic exploration system in China.This paper analyzed the research status of seismic exploration system domestically and abroad,introduced the composition and working principle of seismic exploration system.Then,studied the key technology of power station design in seismic exploration system--high-speed communication circuit,transmission line impedance matching,communication protocol and power management,etc.Based on these,the overall design scheme of the power station was proposed,and the hardware circuit and system software of the power station were designed.Finally,the power station realized the data acquisition and power management of data acquisition stations in the laboratory environment.The main work of this paper is summarized as follows:1.Analysed the research status of the seismic exploration system domestically and abroad.Based on these,the basic principle of seismic exploration system was introduced,the arrangement structure of the seismic exploration system was studied,especially the arrangement structure of power stations and the data acquisition stations.Then,analysed the two key problems in the process of power station design,the main factors influencing the load ability of the power station and the line impedance matching problem in high speed communication circuit.2.A custom ringlike communication protocol was proposed,which supports 4Mbps and 100Mbps communication rates.Based on this protocol,only one device is transmitting data at the same time,and the direction of data transmission is fixed,which can effectively avoid data collision and conflict.This paper introduced the communication protocol in detail from the aspects of data transmission path,frame structure,token management and codec.3.The hardware circuit and system software of the power station prototype were designed.The hardware circuit mainly included two parts,one is the communication interface circuit composed of 4Mbps/100Mbps differential communication circuit,Ethernet circuit and UART circuit,and the other is the power management circuit composed of power protection circuit,power isolation circuit,power conversion circuit and power controlling circuit.In the process of software design,Verilog HDL language was used in the Quartus Ⅱ development environment to complete the programming of the power station.Finally,the main functions of the power station were realized,including:instruction sending,seismic wave acquisition,data uploading,data analysis and power management and other functions.4.The performance of the power station was tested and analysed,including the power supply circuit,load capability and signal quality of 100Mbps communication circuit.The whole process from system initialization to data collection and data uploading was simulated.The experimental results show that the prototype of power station designed in this paper has certain power management ability for the data acquisition stations and can control the data acquisition stations to work for a long time.At the same time,the power stations support high-speed communication at the baud rate-of 100Mbps.In general,the power station system is stable,reliable,with high bandwidth utilization,and can meet the expected design requirements.It also lay a foundation for further research and application of the seismic exploration system. |
