Instrumentation & Measurement Magazine 25-1 - 95

Fig. 12. For May 12-13, 2019, UTC time, group delay of the C5B transponder of the APSTAR-7 satellite after coordinate baseline correction.
where i is the time scale that corresponds to each data point, xi
is the residual error of the two measurements at time i, and N is
the number of samples.
Data Processing and Result Analysis
According to the system operating modes that are listed
in Table I, the ground stations were organized for the observation
experiments. The data processing results are
presented in Fig. 6-13, respectively. In Fig. 8, data that correspond
to the second set of GEO-3.7m equipment delay
measurement results are missing in various time periods.
To ensure the integrity of the test results, the missing data
are fitted, and the results are presented in Fig. 9. Since the
APSTAR-7 satellite and the ground station are relatively stationary,
the correction distance of the baseline distance of the
antenna coordinate in Fig. 11 varies minimally, namely, by
approximately 30 ps. The difference between the two-day
measurement results of the C5B transponder group delay
of the APSTAR-7 satellite is presented in Fig. 13. According
to the results in the figure, the coincidence between the
Fig. 13. For May 12-13, 2019, UTC time, comparison of the measurement results of the C5B transponder group delay of the APSTAR-7 satellite, RMS = 0.165 ns.
February 2022
IEEE Instrumentation & Measurement Magazine
95

Instrumentation & Measurement Magazine 25-1

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