Journal of Physics: Conference Series

2131 (2021) 042096
IOP Publishing
doi:10.1088/1742-6596/2131/4/042096
7
Figure 7. Dependences of the В
i
 coefficient on the reliability of the radio communication channel for non-
electrified (curve 1) and electrified (curve 2) railway sections 
B
wrs
– coefficient that takes into account the deterioration of communication conditions in channels 
with wearable radio stations (closed routes, deep fluctuations, etc.). 
Thus, using basic propagation curves and correction factors, it is possible to estimate the energy of 
a specific radio path. 
At the same time, to ensure reliable radio communication, the signal level at the input of the radio 
station u`
2
should not be lower than the real sensitivity of the receiver u
2min
, at which the quality of 
communication is not lower than the specified one. 
The value of u
2min
depends on the type of traction on the railway section, is determined by the 
regulatory documents of Russian Railways, and lies in the range from 4 to 14 dB. Note that a separate 
work [16] is devoted to the analysis of standards for the levels of electromagnetic radiation in wireless 
railway communication systems. 
Using the described methodology for calculating the characteristics of a 160 MHz radio channel, as 
a rule, two problems arising at the design stage of radio networks are solved: calculation of the radio 
communication range at given antenna heights; calculation of the required antenna installation height 
to ensure a given radio communication range. 
3. Results 
In our case, another problem must be solved - according to the given heights of the installation of the 
antennas, according to the known distance between the transmitter and the receiver, as well as taking 
into account the values of other known correction factors, to find the predicted reliability of the radio 
communication channel, that is, readiness of the channel for radio coverage. 
The procedure for solving this problem for each point of the radio communication path is as 
follows: 
1. From the given values of the heights of the installation of antennas and the distance between 
them from the base propagation curves (Figure 6), the value of the signal voltage u`2 at the input of 
the radio receiver is found. 
2.Taking into account the given value u2min and the values of the above-described correction 
factors known for the given communication conditions, the value of the coefficient characterizing the 
reliability of the radio communication channel is determined: 

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Intelligent Information Technology and Mathematical Modeling 2021 (IITMM 2021)
Journal of Physics: Conference Series
2131 (2021) 042096
IOP Publishing
doi:10.1088/1742-6596/2131/4/042096
8
В
i
 = u
2min
 – u'
2
 + В
f
 + В
c
 + В
l
 + В
p
 + В
h
 + В
wrs
 – G
1
 + G
2
 
(1) 
3. According to the found value of the coefficient В
i
from the graph shown in Figure 7, the required 
value of the availability for the radio coverage of the radio channel at a given point of the route is 
determined. 
Carrying out the calculation according to the described method for each point of the route, in which 
communication with a given stationary radio station is possible, makes it possible to plot the 
dependence of the value of the availability factor for radio coverage on the coordinate of the path. An 
example of such a dependency is shown in Figure 8.