Instrumentation & Measurement Magazine 24-4 - 110

Fig. 8. Diagram of the relationship between the speed and E10
at the neutral sections.
are 71.93 dBμV/m, 70.88 dBμV/m, and 89.05 dBμV/m,
respectively.
According to the above results and Table 4, the curves of
E, f, and v are fitted. The influences of the train speed on E10
of
the PCA in the frequency range of OBS, VHFCS, and GBS are
shown in Fig. 7 and Fig. 8.
The EMI does not exceed the limits (E10(Limit)) of all navigation
stations when the train passes through the common
sections. However, for the neutral sections, EMI of the PCA violates
the limits except in the frequency range of GBS. The EMI
in the frequency range of OBS and VHFCS will be higher than
the limits if the train exceeds a certain speed. So, the X point in
Fig. 6 is a sensitive position for OBS and VHFCS.
Calculation of the Limits of Train Speed
As can be seen from the theoretical analysis, the radiated
power of the PCA increases with the train speed, which is the
main reason that E of the PCA increases with the speed. The
maximum train speeds which do not affect the signals of the
OBS and VHFCS can be calculated. As shown in Fig. 9, E10
in the frequency ranges of OBS and VHFCS exceed E10(Limit)
(71.93 dBμV/m and 70.88 dBμV/m) when the train speed
is beyond 225 km/h and 215 km/h, respectively. Therefore,
for this railway line, the train speed cannot exceed 215 km/h
when the train passes through the X point.
Critical Factors in the Assessment
Process
The following key factors need to be noted if the speed factor
is considered in the EM environment assessment process
of the airport:
Critical Factors for Practical Measurements
The purpose of the field measurement is to obtain the real and
reliable EMI intensity from PCA of the high-speed train. The
following aspects need to be noted:
◗ Change of measurement position: In order to obtain all
kinds of measurement data, the test position is not fixed
in electromagnetic environment assessment. Thus, the
variation of measurement distance and the deviation of
instrument movement probably cause the uncertainty
error. Therefore, all of the results should be converted

Instrumentation & Measurement Magazine 24-4

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