Instrumentation & Measurement Magazine 24-4 - 109

Table 3 - The value of n in the 10 m replacement algorithm
Frequency
(MHz)
n
108
1.2
Table 4 - The parameters of relation curves
Frequency (MHz)
Site
Speed
(km/h)
80
Common Section
108 ∼ 336
(OBS, VHFCS, and GBS)
Neutral Section
110
130
175
250
110
130
180
200
250
a
-12.59
-13.59
-14.05
-14.78
-15.08
-15.05
-15.15
-15.32
-15.50
-16.00
b
73.19
76.39
78.46
82.15
86.15
97.44
98.44
100.54
102.74
106.15
value of EMI, namely, Es
-E ≥ R.
According to (10), (13), and Table 5, the maximum limits of
EMI at the distance of 10 m (E10(Limit)
) can be calculated by:
E ERs 
E
   
10( Limit)
where dn
94.77 10 log10 PG 20log10
d
d
n
s
(14)
is the distance from the PCA to the airplane. Considering
the height of the viaduct and the power supply line,
the arc is 20 m from the ground, namely, dn
Fig. 6, Table 5, and (14), E10(Limit)
= h-20. Based on
of OBS, VHFCS, and GBS
Fig. 6. The location and distance of the navigation equipment, aircraft, and
intersection.
Table 5 - Relevant parameters
of navigation equipment
Name
OBS
VHFCS
GBS
P (W)
50.0
20
9.5
G (dB)
2
5
14.3
ds
ds1
ds2
ds3
(m)
= 4000.3
=1001.4
=4031.5
R (dB)
20
109.7
110
115
119
126.48
128
1.0
where P and G are the
transmission power and
the antenna gain of the navigational
equipment; and
ds
is the distance from the
navigational equipment to
the aircraft. The relevant
parameters of the navigational
equipment in this
paper are listed in Table
5, where R is the margin
to ensure the quality of
navigation signals. At the
same frequency, the signal
strength (Es
) of the navigational
stations should be at
least R dB more than the E
135
329.3
330.5
332
and GBS to the airplane, respectively. Then, we calculate the
EMI limits allowed here and further derive the speed limits of
the train passing through the X by the EMI limits.
The signal strength (Es
) of the navigation stations is specified
as follows [28]:
s
June 2021
E =134.77 10log PG d10
10
 20log s
(13)
Fig. 7. Diagram of the relationship between the speed and E10
sections.
IEEE Instrumentation & Measurement Magazine
at the common
109

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