Zobrazeno 1 - 10
of 31
pro vyhledávání: '"coal mine communication"'
Autor:
BAI Xuefeng, SHU Xiaojun
Publikováno v:
Gong-kuang zidonghua, Vol 49, Iss 7, Pp 14-18 (2023)
Mine communication is an indispensable part of the intelligent development of coal mines. This paper analyzes the advantages and disadvantages of different communication systems and technologies in different development stages of wireless communicati
Externí odkaz:
https://doaj.org/article/a0f3a157e6da4a61aaa02dfded28b6dc
Publikováno v:
Gong-kuang zidonghua, Vol 49, Iss 5, Pp 127-132 (2023)
Due to space limitations, multi frequency multiple-input multiple-output (MIMO) antennas have strong coupling problems caused by small unit spacing. In order to solve the above problems, a mine high isolation tri-band MIMO antenna has been designed.
Externí odkaz:
https://doaj.org/article/f275392f12a24202ad1b7dc5871c09ce
Publikováno v:
Gong-kuang zidonghua, Vol 48, Iss 7, Pp 125-129 (2022)
With the application of 5G technology in the coal mine, the signal interference between multiple systems becomes more and more intensive. This seriously affects the quality of data, voice and image communication. The coexistence of multiple systems i
Externí odkaz:
https://doaj.org/article/f6b82d65d3854c639f2296d9e1bd7a1b
Autor:
HU Qingsong, WANG Shengnan
Publikováno v:
Gong-kuang zidonghua, Vol 48, Iss 2, Pp 93-99 (2022)
Mine accidents often lead to partial communication link damage and communication network connectivity deterioration. Using residual nodes and limited new nodes, reconstructing coal mine rescue network by constructing local virtual backbone network ca
Externí odkaz:
https://doaj.org/article/26b0af52b8f64911890ee46341ca3e4d
Publikováno v:
Energies, Vol 15, Iss 18, p 6550 (2022)
With the advancement of an intellectual and numerical society, the coal mining industry has also begun to change to intelligence. As an important aspect of intelligent coal mine construction, coal mine communication has put forward more stringent sta
Externí odkaz:
https://doaj.org/article/a15fefc8f2d84b47a56081a56812f8e5
Autor:
SHENG Lu
Publikováno v:
Gong-kuang zidonghua, Vol 44, Iss 9, Pp 67-72 (2018)
For problems of private network of coal enterprise such as poor network quality, regional limitation, lack of reasonable scheduling of bandwidth resources, inability of enterprise cloud platform to remote backup and poor network security, a construct
Externí odkaz:
https://doaj.org/article/3eadbf77067343328a6c3135febff80f
Autor:
SUN Zhexing, WANG Yanwen
Publikováno v:
Gong-kuang zidonghua, Vol 44, Iss 5, Pp 31-35 (2018)
Due to affects of clock synchronization error, clock timing error, multipath effect, not line of sight （NLOS）delay error, electromagnetic disturbance between positioning substation and positioning card, it has large positioning error in the exist
Externí odkaz:
https://doaj.org/article/1bff5a862cd94442bf233685c8f95beb
Autor:
ZHANG Liya
Publikováno v:
Gong-kuang zidonghua, Vol 44, Iss 3, Pp 12-16 (2018)
For problems of independent operation of each system in coal mine underground and too many base stations with shortage of wireless data transmission bandwidth, a mine integrated communication system was designed by use of LTE technology. The system c
Externí odkaz:
https://doaj.org/article/25211872b12040ce80ee1ea347fddd93
Publikováno v:
Gong-kuang zidonghua, Vol 40, Iss 9, Pp 39-43 (2014)
In view of problems of complex underground channel environment and increasing of noise and error rate caused by multipath effect, a system model of orthogonal frequency division multiplexing was established, and the least squares error estimation alg
Externí odkaz:
https://doaj.org/article/80f3bfddde054413b6a5ba41178bc8fe
Autor:
HE Yonghua
Publikováno v:
Gong-kuang zidonghua, Vol 40, Iss 3, Pp 11-15 (2014)
Major sources of noise in audio system of fully mechanized working face were researched in the practice. Advices of design of filter were given for different application requirements, and band-pass active filter was designed. Requirements of sound fi
Externí odkaz:
https://doaj.org/article/a1f960575716409ea24fc32dbdfa6eea