Underground low-frequency wireless communication system based on low-power small electric antenna

Abstract

The invention provides an underground low-frequency wireless communication system based on a low-power small electric antenna. The underground low-frequency wireless communication system comprises a transmitting end FPGA (Field Programmable Gate Array) digital control module, a power amplification and impedance matching module, a small-sized very low frequency transmitting antenna, a small-sized very low frequency receiving antenna, a receiving end filtering and amplifying module, a receiving end FPGA digital control module and an upper computer which are sequentially connected with one another. The underground low-frequency wireless communication system can be used for overcoming the detects of large size and high transmitting power of a conventional very low frequency antenna by using a magnetic induction manner for replacing an electromagnetic wave communication manner and completing the directional wireless communication between the undergrounds and between the underground and the ground surface and can also be used as an independent module to complete the middle and short-distance wireless transmission of underground sensor data to a ground surface receiving device.

Description

technical field [0001] The present invention relates to an underground low-frequency wireless communication system based on a low-power electrically small antenna, which belongs to the technical field of integrated circuit design for subsurface low-frequency communication systems, and particularly relates to an electrically small antenna for realizing low-frequency communication between nodes buried in soil ( ESA, electrically small antenna) design. Background technique [0002] The wireless subsurface sensor network (WUSN) can realize the monitoring of the subsurface environment, such as the water and mineral content in the soil, the oil leakage of the oil reservoir, the plate movement, the landslide and the monitoring of the earthquake, which is currently quite active and promising research field. However, since the transmission medium is no longer air, but soil, rock, and water, wireless communication has certain challenges for underground environments. For underground ...

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In addition, its students summarize their work and conduct simulations from other angles, but they stop at theoretical analysis and do not conduct actual experiments

[0005] The size of the communication antenna is related to the specific implementation. At present, the communication system uses electromagnetic wave communication. Since the length of the antenna is comparable to the communication wavelength, in the case of very low frequency communication, the size of the antenna reaches several kilometers, which is not easy to bury the node; and When a system that supports electromagnetic wave communication is applied to communication in the soil, its transmission power is also required to be very large, which requires us to re-plan the problem of underground communication

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