Mine working face detection system and method

The invention discloses a mine working face detection system and method. The system comprises a transmitter and a receiver. The transmitter is used for transmitting first signals of which the amplitude is not zero to a mine working face in a first time period T1 and transmitting second signals of which the amplitude is zero to the mine working face in a second time period T2. The receiver is used for receiving first transmission signals obtained by transmitting the first signals and interference signals through the mine working face under the signal control of a controller, and receiving second transmission signals obtained by transmitting the interference signals through the mine working face. Due to the fact that the amplitude of the second signals is zero, the second transmission signals are transmittance signals of the interference signals, the difference between a total field intensity value H of the first transmission signals and a field intensity value H0 of the second transmission signals is obtained, and field intensity increments H1 of receiving points are obtained. The receiver respectively receives the first transmission signals and the second transmission signals, interference of the interference signals is eliminated, eventually the field intensity increments are obtained, and detection of the mine working face is more accurate.