Synchronization For Dual-frequency Ip Instrument Digital Measurement And Control Technology

For a long time, the electrical exploration theory has contributed greatly to exploring various mineral resources which are in urgent need for the development of our national economy. As the vehicle of electrical exploration theory, geophysics instrument has become maturer and maturer with the development of the electrical exploration theory and the combination of the theory with electronic technology, the technology of signal processor and micro-computer technology.The theory of dual-frequency IP method invented by academician He Jishan can simultaneously send and receive both the electric current of high-frequency signal and that of low-frequency signal, which, in contrast to other electrical exploration theories, have various merits such as greater capability of anti-jamming, less influence from the variation of electric current, higher accuracy of exploration, faster speed of searching information, higher efficiency, more convenient and so on. With the development of electrical exploration and the demand of geophysics exploring methods and techniques for fast and accurately searching deposit in the deep earth, higher requirements have been raised out in the function and performance of the present-using electrical exploration instrument.According to the actuality of the technologic development of the dual-frequency IP theory, with dual-frequency IP theory, the principle of coherent detection method, communication principles, Pseudo-random principles, micro-computer principle and other relevant theories as the theoretic frame to study the dual-frequency IP instrument invented by academician He Jishan, this thesis has proposed a key technology to realize simultaneous control and simultaneous measure in dual-frequency IP instrument, which, through adding to double wave a kind of digital communication signal modulated by Pseudo-random code technology, can meet the technologic requirements of simultaneous control and simultaneous measure in the system of dual-frequency IP. The purpose of this technology is to improve the exploring accuracy of the geophysics instruments based on the electrical exploration theory and to meet the technologic requirements of exploring the deposit beneath the deep earth.