Research On The Data Transmission Techniques In Distributed Electromagnetic Exploration Receiver System

In recent years, the grand scale of China's national economy, rapid industrial development, the demand of mineral raw materials increased sharply, the need of advanced exploration technology is urgent. Hence Prompted electric exploration from scientific research into the practical stage, and developed rapidly. However, Our domestic electromagnetic exploration techniques in probing depth, anti-interference ability and measurement precision is far behind developed countries.And with the development of modern science and technology, industrial technology,detect objects become more complex, more and more wide geographical distribution, a comprehensive analysis of all kinds of information become increasingly important. The development of detection equipment requirement is multi-channel, multi-functional, distributed aspects.The fast,convenient, long-distance communication system for distributed electromagnetic detection equipment is essential. At the same time, distributed electromagnetic detection system data transmission network is different from everyday life is now common computer network. Electromagnetic instruments of communication systems have special requirements.This thesis introduces the distributed electromagnetic detection equipment system works, the system composition and working methods,Calculating the amount of data acquisition systems and communications requirements.Propose cable network and wireless data transmission network data transfer program of mutual cooperation. By analyzing the characteristics of various serial standards, choose a practical and easy to implement RS-485 standard cable transmission network formation.Electromagnetic design of distributed detection system wired network hardware and software. According to the actual circumstances for the system works in a complex field environment, To meet the application requirements,In this thesis, we have done in-depth study in network cabling connections, bus matching, fail-safe, ground isolation, In order to improve RS-485 network security and reliable.Achieve the Reliable application of RS-485 bus network in Distributed electromagnetic detection system.Formulate the framework of the communication protocol and the specificGoal and contents of every layer,focusing on the completion of the design and testing of the physical layer, link layer design and functional test, the protocol and communication software development of the system application layer which is based on MSComm control Network reliability testing to prove the feasibility of a custom protocol.To break the bottleneck of the wireless network, local storage options put forward, combined with wireless transmission network not only improves the efficiency of field work, but also to ensure data security. Storage solutions based on USB technology, With CH375 as a core device, read and write documents by way of sectors. After measurement, read and write speeds up to 200Kbps or so, to support the USB device capacity up to 8GB.And the system can store files for a variety of formats, and file classification management. Stored data can be open in any computer supporting FAT file system.Network Testing the data transmission on the wired network and the wireless transmission network which is combined with local storage respectively, experimental results show that the data transmission system can better realization function, the designed RS-485 data transmission network used in the distributed electromagnetic detection system.The experimental results show that the system designed in this thesis is practical. Combination of local storage can reduce the load on the wireless network, just a cycle of collecting data transmission, both real-time observation data, but also improve the efficiency of field work.Finally, the thesis of the work are summarized, in order to improve the system design, presented its follow-up study of design and some of the recommendations.