Instrumentation & Measurement Magazine 25-8 - 28
Fig. 3. The performance parameter of R&S HL223. (a) Typical gain; (b) Typical directional radiation patterns at 750 MHz.
test at different distances and convert the test data to a value of
10 m-method according to the conversion formula [20]:
E En 20lg
10
where E10 and ED
D
D
10
(3)
are the test value by 10 m-method and D distance
respectively; n, which is 1.2 in frequency 30 MHz~110
MHz and 1.0 in frequency 110 MHz~1 GHz, is conversion
coefficient.
Test Results and Radiation Characteristic
The antenna coefficient is 13.9 dB in this test, and the cable
loss is 0.8 dB. Therefore, the electric field in distance of D
is ED
Table 3 gives the test results of frequency 330.5 MHz at PS,
OL and NS.
From Table 3, we conclude that:
◗ In the GS frequency band, radiation emission generates
when the train passes through the phase separation, overlap
or common site. The electromagnetic interference in
phase separation is the maximum.
◗ In the phase separation, because pantograph arc generates
frequently, the electromagnetic interference is
intense. Accordingly, in this research, what we mainly
take into consideration is the electromagnetic interference
in phase separation.
=U+14.7 dB. The test result at PS when the high-speed
train passes is shown in Fig. 4. where there are three detection
modes: peak (PK), quasi-peak (QPK) and average value (AV).
The standards specify that the emission from the railway system
to the outside world should be analysed and evaluated
by the data using the peak (PK) detection [21]. In this article,
we use the maximum of the PK as the test result, and we take
the frequency spectrogram as an example, which is shown in
Fig. 5.
Influence of Pantograph-catenary Arc
to GS
Analysis of the interference to GS
According to the test data, the radiation field intensity of the
pantograph-catenary arc is 75.65 dBμV/m, 56 dBμV/m and
58.95 dBμV/m when the train passes though the PS, OL and
NS, respectively. The relationship between the contributing
signal of GS received by aircraft and the interference signal
Fig. 4. Test result when high-speed train passes at PS.
Fig. 5. The frequency spectrogram.
28
IEEE Instrumentation & Measurement Magazine
November 2022
Instrumentation & Measurement Magazine 25-8
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