scholarly journals Some Researches about the Safety of the Underground Communication Cables

1968 ◽  
Vol 84 (957) ◽  
pp. 22-26
Author(s):  
Yoshiro SAITO
Keyword(s):  
Underground Communication

scholarly journals Gaped Two-Loop Antenna-Based Magnetic Transceiver With an Empirical Model for Wireless Underground Communication

IEEE Access ◽  
2021 ◽  
Vol 9 ◽  
pp. 34962-34974
Author(s):  
Jaewoo Lee ◽  
Hyun Joon Lee ◽  
Jang-Yeol Kim ◽  
In-Kui Cho
Keyword(s):  
Empirical Model ◽  
Loop Antenna ◽  
Underground Communication

scholarly journals Advanced diagnostic system for underground communication networks with ventilation on demand

2021 ◽  
Author(s):  
Mohamed Daoud
Keyword(s):  
Communication Networks ◽  
Communication Systems ◽  
Communication Protocol ◽  
Diagnostic System ◽  
Underground Mines ◽  
Control Room ◽  
Specific System ◽  
On Demand ◽  
Underground Communication ◽  
Receiver Unit

In this thesis, a novel diagnostic system has been developed to increase the realibility of leaky feeder communication systems in underground mines. The new system is based on three main parts: 1) Diagnostic Receiver Unit (DRU) located in the control room above ground; 2) several Diagnostic Transponder Units (DTU) connected to amplifiers, Power Supply Units (PSU), fans and sensors; and 3) Communication protocol that was designed for this specific system. The amplifiers, PSU, fans, and sensors in the system cascade will be able to communicate freely with the control room through the leaky cable to send information about their current conditions, and receive configuration messages. A new concept is also presented that provides energy saving in mines; Ventilation-on-Demand where the fans will operate according to the current situation of each section in the mine. This is made possible through a series of interrupt messages that is sent from the DTU attached to the fan/sensor to the DRU in the control room.

scholarly journals On-Site and External Energy Harvesting in Underground Wireless

Electronics ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 681 ◽  
Author(s):  
Usman Raza ◽  
Abdul Salam
Keyword(s):  
Energy Harvesting ◽  
Wireless Power Transfer ◽  
Energy Sources ◽  
Power Transfer ◽  
Wireless Power ◽  
External Energy ◽  
Term Operation ◽  
Available Energy ◽  
Underground Communication

Energy efficiency is vital for uninterrupted long-term operation of wireless underground communication nodes in the field of decision agriculture. In this paper, energy harvesting and wireless power transfer techniques are discussed with applications in underground wireless communications (UWC). Various external wireless power transfer techniques are explored. Moreover, key energy harvesting technologies are presented that utilize available energy sources in the field such as vibration, solar, and wind. In this regard, the Electromagnetic (EM)- and Magnetic Induction (MI)-based approaches are explained. Furthermore, the vibration-based energy harvesting models are reviewed as well. These energy harvesting approaches lead to design of an efficient wireless underground communication system to power underground nodes for prolonged field operation in decision agriculture.

Modeling and Simulation of the Propagation Characteristics by Underground Current Field

2013 ◽  
Vol 385-386 ◽  
pp. 1568-1571
Author(s):  
Yi Dong Xu
Keyword(s):  
Mathematical Model ◽  
Signal Transmission ◽  
Signal Propagation ◽  
Underground Mines ◽  
Constant Current ◽  
Propagation Characteristics ◽  
Current Field ◽  
Channel Characteristics ◽  
Underground Communication ◽  
The Mathematical Model

It's one of the effective channels for short-distance wireless communications through stratum in underground mines on emergency communications. The geologic structure is complex in mines, in practical environments. It means there is a considerable difference in conductance property and channel characteristics. In order to realize effective communication through stratum, its necessary to explore and study underground signal transmission by establishing mathematical model of underground signal propagation characteristics based on the theory of constant current field and simulating the mathematical model with MATLAB. We established a simulation model of underground communication channel physics experiments and obtained the amplitude frequency characteristic of the channel, with which we can get the error comparison between theory and test.

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