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Outline
To optimize the antenna layout for mine wireless communication systems, a 3D model of a rectangular roadway measuring 5 m in width and 3.4 m in height was constructed using the Shooting and Bouncing Ray tracing (SBR) method. A multi-scale analysis of power attenuation characteristics in the 0.9 GHz, 2.4 GHz, and 3.5 GHz frequency bands within roadways was conducted across transmission distance, longitudinal cross-section, and spatial distribution. The impact of antenna positioning on wireless transmission was also investigated. The results show that the 0.9 GHz frequency band exhibits superior transmission characteristics compared to the other two bands. The mean longitudinal cross-sectional power at different transmission distances is 6.60-9.17 dBm and 10.49-12.63 dBm higher than that for 2.4 GHz and 3.5 GHz, respectively. The optimum horizontal position for the antenna is within 0.01 to 0.1 m from the roadway wall. When the antenna was deployed flush against the wall (within 0.01 m of the wall), the spatial power distribution exhibites an asymmetric characteristic. The received power in the adjacent wall area on the same side as the transmitting antenna is 1 to 4 dBm higher than on the opposite side. A stable and strong reception signal can be obtained when the height difference between the transmitting and receiving antennas is less than 0.5 m. The research findings may serve as a reference for optimizing base station placement and antenna layout within roadways, thereby facilitating the development and construction of intelligent communication systems for mining operations.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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