A magnetic induction through-the-earth communication scheme based on three-axis orthogonal receiving coil
In order to improve the flexibility and coverage of the magnetic induction through-the-earth(TTE)communication system,a new TTE communication scheme was proposed.The scheme uses a single axis air coil as the ground transmitter antenna and three air coils with the same parameters as the receiving antenna.Firstly,the communication signal was received by space diversity,so that the underground receiver of the system can be placed in the tunnel in any posture and achieve a wider range of signal coverage.Secondly,in order to eliminate the signal interference caused by the near-field coupling between the receiving coils,the three antennas of the receiver were set to a spatial structure with a common center and orthogonal to each other.Finally,based on the weak coupling between the transmitting and receiving coils in the long-distance communication scenario,a set of equivalent circuit models corresponding to the receiving scheme were established.A simulation experiment platform was built to analyze the communication performance of the proposed scheme.The results show that the signal receiving strength of the three-axis orthogonal magnetic induction TTE communication receiving scheme can reach more than 57.7%of the ideal signal strength under the same communication distance,and the receiving power can reach more than 33.33%of the optimal receiving power.The scheme proposed in this paper solves the problem of communication blind area in the single-axis coil receiving scheme,and effectively improves the coverage of the long-distance magnetic induction TTE communication system and the adaptability to emergency rescue scenarios.
through-the-earth communicationmagnetic inductionlong-distanceemergency communication
万方数据
维普
