Instrumentation & Measurement Magazine 25-5 - 38

sampling interval at time keeping laboratories of NTSC and TP
from July 3-6, 2020 were used.
As shown in Fig. 15, the result calculated through BDS-3
PPP has the same trend with BIPM. Taking the BIPM time
link data as a reference, the root mean square of the residual
is 0.2994 ns. Fig. 16 and Table 6 show the Allan and time
deviation comparisons between NTSC and TP using the multiGNSS
fusion PPP time comparison. Figure 16 and Table 6 show
that the Allan and time deviation of UTC (NTSC)-UTC (TP) by
using multi-GNSS fusion PPP are very close to those of BIPM,
and can be used for high-precision time comparisons.
Conclusion
Fig. 15. The UTC (NTSC) - UTC (TP) by multi-GNSS fusion PPP.
This study carried out the PPP high-precision time comparison
experiment based on the BDS-3 new signal. The measured data
of the pseudo-range and carrier phase observations were sampled
at an interval of 30 s in NTSC and TP, and the precise orbit
and clock products published by the GFZ were used. Several
experiments that included BDS PPP and multi-GNSS fusion
PPP time comparison were conducted on short and long-baseline
time comparison.
Fig. 16. The ADEV and TDEV of time difference between NTSC and TP by
Multi-GNSS fusion PPP.
The experiment shows that the result of fluctuation using
the BDS-3 new signal PPP CCD time comparison are in ±0.1 ns,
the standard deviation of BDS-3 is smaller than that of BDS-2,
and therefore the short-baseline time comparison performance
of BDS-3 PPP is better than that of BDS-2. The standard deviation
of BDS-3 PPP has increased by 13.19% compared with
BDS-2. In the long-baseline time comparison, the comparison
data between the NTSC and TP based on BDS-3 and multiGNSS
fusion PPP have the same trend with the data released
by BIPM. Taking the BIPM time link data as a reference, the
root mean square of the residual are 0.7039 ns and 0.2994 ns.
Meanwhile, in terms of the Allan deviation and time deviation
of long-baseline time comparison, the BDS-3 and multi-GNSS
fusion PPP are of the same magnitude with BIPM. The experiment
shows that the BDS-3 PPP or multi-GNSS fusion PPP can
be used for high-precision short and long baseline time comparison.
Therefore, the study will promote the use of BDS-3 in
high-precision time comparison and in the calculation of the
UTC as a formal method by BIPM in the future.
Table 6 - ADEV and TDEV of UTC(NTSC) - UTC(TP)
ADEV
Tau(s)
BIPM
300
600
1200
2400
4800
9600
19200
38400
76800
38
3.847E-13
2.725E-13
1.945E-13
1.408E-13
9.202E-14
6.818E-14
5.311E-14
2.994E-14
2.165E-14
Multi-GNSS
3.984E-13
2.789E-13
1.965E-13
1.424E-13
9.638E-14
7.165E-14
6.090E-14
2.763E-14
2.143E-14
BIPM
6.661E-02
7.518E-02
9.823E-02
1.393E-01
1.754E-01
2.731E-01
4.377E-01
4.028E-01
8.576E-01
IEEE Instrumentation & Measurement Magazine
Multi-GNSS
6.901E-02
7.668E-02
9.936E-02
1.406E-01
1.881E-01
2.966E-01
4.826E-01
3.559E-01
8.750E-01
August 2022
TDEV

Instrumentation & Measurement Magazine 25-5

Table of Contents for the Digital Edition of Instrumentation & Measurement Magazine 25-5

Instrumentation & Measurement Magazine 25-5 - Cover1
Instrumentation & Measurement Magazine 25-5 - Cover2
Instrumentation & Measurement Magazine 25-5 - 1
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Instrumentation & Measurement Magazine 25-5 - Cover3
Instrumentation & Measurement Magazine 25-5 - Cover4
https://www.nxtbook.com/allen/iamm/26-6
https://www.nxtbook.com/allen/iamm/26-5
https://www.nxtbook.com/allen/iamm/26-4
https://www.nxtbook.com/allen/iamm/26-3
https://www.nxtbook.com/allen/iamm/26-2
https://www.nxtbook.com/allen/iamm/26-1
https://www.nxtbook.com/allen/iamm/25-9
https://www.nxtbook.com/allen/iamm/25-8
https://www.nxtbook.com/allen/iamm/25-7
https://www.nxtbook.com/allen/iamm/25-6
https://www.nxtbook.com/allen/iamm/25-5
https://www.nxtbook.com/allen/iamm/25-4
https://www.nxtbook.com/allen/iamm/25-3
https://www.nxtbook.com/allen/iamm/instrumentation-measurement-magazine-25-2
https://www.nxtbook.com/allen/iamm/25-1
https://www.nxtbook.com/allen/iamm/24-9
https://www.nxtbook.com/allen/iamm/24-7
https://www.nxtbook.com/allen/iamm/24-8
https://www.nxtbook.com/allen/iamm/24-6
https://www.nxtbook.com/allen/iamm/24-5
https://www.nxtbook.com/allen/iamm/24-4
https://www.nxtbook.com/allen/iamm/24-3
https://www.nxtbook.com/allen/iamm/24-2
https://www.nxtbook.com/allen/iamm/24-1
https://www.nxtbook.com/allen/iamm/23-9
https://www.nxtbook.com/allen/iamm/23-8
https://www.nxtbook.com/allen/iamm/23-6
https://www.nxtbook.com/allen/iamm/23-5
https://www.nxtbook.com/allen/iamm/23-2
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