| At present, there are great changes in petroleum logging technology with the rapid development of electronic industry, the well logging technique has been changed from analog logging into Computer Numerical Control (CNC) logging and imaging logging by the way of digital logging. More and more data information need to be transmitted in logging system, therefore, the speed of data transmission becomes one of the problems which restrict the improvement of characteristics of logging system, how to transmit the logging signal stably with high speed and receive them correctly becomes an important object for high-speed data transmission system.This paper introduces the basic principle of data logging, expatiates the transmission procedure of signal in CNC logging system, discusses the media and frequency for signal transmission, analyses in detail the characteristics and formula and coding rule and encoding rule of BPSK communication, and their applications in CNC system, studies the problems in researches and productions and learns to solve them, and researches the interferences in transmission process and its suppression in CNC system.The author has taken part in the design of CNC system ERA2000C and the production of EILOG-05, in which the data transmission with a transmission speed100k bit/s, so as to make the system optimized, and improves the technical performance of the whole system, enhances the combining capacity of the CNC system. |
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