Research And Design Of Remote Explosion Control System For Seismic Exploration

With the development of wireless communications technology, the requirement of wireless trigger and control technology is gradually improved in various fields. In certain areas, we cannot use the "check-retransmission" mechanism, such as wireless trigger and control facing large geophysical experiment and high energy physics experiments. These experiments often put forward higher requirements for reliability of system synchronization and data transmission. For example, the wired transmission is not convenient because of the wide operating range and the complex terrain. The wireless control system becomes one of main auxiliary equipment for seismic exploration, mainly used for high pressure blasting machine initiation, data acquisition and transmission. The wireless control blasting machine synchronous excitation will be directly related to the quality of seismic reflection echo receiving accuracy and seismic data, meanwhile, the reliability of data transmission will not only relates to the explosive material waste, but also relates to personal safety. In high-energy physics experiments, the wireless control technology in many occasions can be an important auxiliary system for a large area detector network layout, clock synchronization, control triggering. The wireless control technology has important potential application value in these areas. Now, the wireless control system often uses single-chip and DSP as the control unit. Because of its own characteristics, single-chip and DSP are weaker than FPGA in precise timing control and parallel processing ability. With the development of FPGA, FPGA provides a platform for the implementation of good reliable wireless data transmission. Therefore, this paper designed a general and reliable long distance wireless control system.The structure of this paper is organized as follows:The first chapter is an introduction, mainly introduced research background and the main content and purpose, brief describing wireless trigger and control technique in seismic prospecting.The second chapter studies the trigger and control system. The chapter first introduces the present status of wireless trigger and control system, and puts forward the design scheme according to the requirement of application environment. After this, the hardware system structure of wireless trigger and control system is described in detail in this chapter.The third chapter introduces the transmission system of the wireless remote control trigger transmission system. A pair of encoder/decoder exchanged data by the two mutual backup data transmission channel to send data at the same time. After Viterbi decoding, the receiving end checked the two way data and selected one as the last data. Using this method, we can achieve reliable data transmission.The fourth chapter introduces the logic design scheme of wireless remote-controlled explosive system. FPGA not only meets the timing of each interface, but also implements the data framing, convolutional coding, viterbi decoding and redundancy check.The fifth chapter introduces the implementation of synchronization of wireless remote control explosive system. The synchronization of system is the main features of the wireless remote control explosive system.The decoder controlled by encoder realizing the synchronous excitation will be directly related to the quality of seismic reflection echo receiving accuracy and seismic data. Seismic exploration equipment requires high voltage ignition circuit of excitation and collection recording system controlled by encoder starting at the same time. Combined with the hardware structure of the system, this paper designs a kind of automatic calibration method.According to the automatic calibration system, we can greatly improve the performance of synchronization system.The sixth chapter introduces the performance analysis and testing system, including the simulation test of the whole system, data transmission and the pressure plate charge discharge test, and gives the relevant test results.The seventh chapter summarizes the main work of this paper and deficiencies. In view of the actual situation, this paper propose the improvement proiect.