Abstract: Mine geological transparency is the basic guarantee of intelligent coal mining,CT transmission detection based on geological radar can realize high-precision detection of hidden disaster causing bodies in large-span (80 ~ 300 m) mining area,and whether the nanosecond-level high-frequency synchronous pulse signal and personnel communication information of geological radar can achieve long-distance real-time mobile transmission directly determines the working efficiency and detection accuracy of CT transmission detection of large-span working face geological radar. In view of the problem of low signal transmission efficiency and difficult synchronization,this paper proposes a mine face CT transmission detection optical fiber transmission and communication control scheme based on geological radar,designs and develops an intelligent signal synchronous transmission communication system,uses STM32F407 as the main control chip supplemented by voice acquisition and playback circuit,photoelectric conversion and transmission circuit and other hardware parts of the communication system,and designs and develops the control software part of the communication system based on the Keil uVision5 development environment. A prototype communication handheld terminal has been formed,aiming to realize CT transmission and synchronous communication of CT transmission detection of mine working face. The test results show that the real-time transmission distance of the system can reach 6 000 m under mine conditions,and the transmission delay time of high-frequency synchronization signal and voice signal of geological radar is 5. 93 ns / m and 1. 9 ms / m,respectively. Compared with the existing transmission and communication methods,the system simplifies the structure of the radar system, realizes the long-distance real-time mobile transmission of high-frequency synchronous signals and voice signals of geological radar,and provides technical support for the construction of mine geological security assurance platform.

Key words: mine geological transparency,geological radar,CT transmission detection,signal synchronization,intelligent communication