Design And Implementation Of Dual-Ship Towed Marine Electromagnetic Real-Time Deck Monitoring System

The marine electromagnetic exploration method has an important position and role in deep-sea oil and gas exploration.The dual-ship towed marine electromagnetic exploration system proposed by China has broken the construction method of the traditional deep-sea fixed station.Both the transmitter and the receiver adopt the near sea bottom towing method,which can obtain more abundant data information and improve the effectiveness of complex oil and gas structure exploration.Aiming at the unified monitoring requirements of the dual-ship towed exploration system,this paper proposes a design scheme of the dual-ship towed ocean electromagnetic real-time deck monitoring system,which realizes the two-way unified monitoring of the real-time working state of the towed transmitter and receiver.The deck monitoring system first determines the main body of the monitoring equipment in the hardware equipment design.The launch vessel and the receiving vessel are each equipped with a deck monitoring system,and a multi-screen display format is designed for different data sources.Secondly,according to the topology of the star Ethernet,a switching hub is selected to connect the communication nodes of each system.The industrial twisted pair is used as the communication transmission medium,and the communication local area network between the deck monitoring system and other systems is built.Finally,by studying the shielding effectiveness of electromagnetic fields and measures against salt spray,anti-mold and anti-humidity at sea,a shielded cabinet with electromagnetic protection and three-proof function is designed for hardware equipment to ensure that the equipment can operate normally under the harsh environment of the ocean.The deck monitoring system first explored the C/S architecture and the peer-to-peer architecture of the communication system.The communication link is constructed by using the highly reliable TCP/IP protocol,and the communication function is realized through the Socket programming interface.In addition,in order to avoid conflicts in the process of multi-source big data transmission,multi-thread technology is applied to receive data from different sources,which improves the response performance of the system.Secondly,the data encoding and decoding method is studied,and the equal length analysis method of electromagnetic data serialization is designed to ensure the real-time performance of data visualization monitoring.Moreover,by studying GDI+ technology,dynamic waveforms are drawn for the operating parameters of each system and the three-axis orthogonal electromagnetic signals,providing a more intuitive and clear monitoring method.furthermore,the use of database technology and text reading and writing combined to achieve real-time,efficient and accurate storage of exploration data,and enhance the speed and security of the system by calling the stored procedure.Finally,an over-limit warning function was designed for all monitoring data to ensure the safety of the exploration work and the operators.The deck monitoring system has undergone several laboratory tests,and the functions of all parts of the hardware and software are functioning normally.The shielding effectiveness calculation of the protective cabinet is in compliance with the standard.In addition,the deck monitoring system participated in the joint commissioning of the lake test system and the sea exploration work in 2018.After debugging and improvement,the deck monitoring system can run reliably for a long time in the sea trial,the data communication is stable,the real-time system interface call is normal,and the state adjustment and timely warning can be realized.The stability and effectiveness of the deck monitoring system are verified,which can meet the unified monitoring requirements of the dual-ship marine electromagnetic exploration work.