Instrumentation & Measurement Magazine 24-4 - 107

EP 20log 0.3 s com neu/ ) 120
10(com neu
/ )
10
(
(9)
According to this analysis, the train speed affects the electric
field intensity of the PCA by impacting the radiation power
of it. Besides, the faster the train speed, the stronger the electric
field of the PCA. It means the increase of the train speed will
lead to stronger EMR from the PCA.
Overview of the Assessment Method
According to the international standards [4], [5], the evaluation
of an airport EM environment must be based on the actual
data. Therefore, it is necessary to carry out experiments to obtain
reliable and real data. The contents of the experiments are
as follows:
◗ Determining the frequency ranges of navigation signals
which need to be evaluated.
◗ Testing and getting the electric field strength (E) values
of the PCA at the different frequency points and train
speeds.
◗ Measuring the distances between different navigation
stations and EMI sources for subsequent calculation of
EMI limits of navigation signals.
Practical Measurement of the E values
The detailed implementation process is as follows:
◗ Selecting the appropriate measurement object and location:
The measurement object is the high-speed train
entering the airport EM environment protection area,
since the EMR generated by such trains is likely to interfere
with aviation navigation. Moreover, the test location
is usually where the train is closest to the runway at the
airport, because the closer the distance, the stronger the
interference.
◗ Testing the distance of PCA to each navigation device.
◗ Measuring the E values of the PCA and fitting the relation
curves between E and frequency at different train
speeds.
Evaluation of the EMI
The EMI limits for each navigation signal can be calculated
by the requirements of relevant standards and the actual distances.
By comparing the above measurement results with the
EMI limits, we can know whether there is interference to the
navigation signals.
Limits of the Train Speed
If there is interference, the speed limit which does not affect the
navigation signals can be calculated by the measurement results.
In the following, an example of a typical high-speed train
in China is used to illustrate this assessment process. The different
trains with various speed limits can be studied based on
the following methods.
Practical Measurements
One high-speed railway in the Sichuan Province of China is
taken as the measurement object in this paper. The maximum
speed of this high-speed railway is 250 km/h. This railway is
divided into two parallel tracks for round trips, and each track
has a separate power supply line. The PCA usually occurs at
the common and neutral sections of the power supply line. Fig.
4a shows the scene of the practical measurement, and Fig. 4b
shows the specific layout.
The linear distances from the antenna to the two parallel
tracks are 41 m and 52 m. In addition, the distances from the
antenna to the neutral sections of the two power supply lines
are 79 m and 83 m, respectively. The height of the antenna is 2
m. The specifications of the instruments used in this measurement
are shown in Table 1.
Fig. 4. The situation of practical measurement. (a) Diagram of the status of practical measurement; (b) Layout diagram of the measurement.
June 2021
IEEE Instrumentation & Measurement Magazine
107

Instrumentation & Measurement Magazine 24-4

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