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Time Transfer Problems in GLONASS

P. P. Bogdanov, A. V. Druzhin, T. V. Primakina, A. Yu. Feoktistov

Transactions of IAA RAS, issue 52, 9–12 (2020)

Keywords: Global Navigation Satellite System, GLONASS Time, coordinated time scale of Russia, monitoring, accuracy parameter

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Abstract

Global Navigation Satellite System GLONASS provides navigation and timing services to different kinds of users. However, now GLONASS timing performance parameters, such as GLONASS Time transfer accuracy and the transfer accuracy of Russian national coordinated time UTC(SU) meet the requirements for the users not completely. The paper is aimed at finding out the possible reasons of insufficient accuracy of time transfer by GLONASS as well as the possible ways of their elimination. The authors analyzed the principles of time transfer by GLONASS and the monitoring results of GLONASS timing performance parameters. The monitoring was based on measurements at Russian State Time and Frequency Reference that generates UTC(SU) and the data provided by Bureau International et Poids and Mesures (BIPM). The results obtained unveiled the following problems in time transfer by GLONASS: – the accuracy of GLONASS Time generation decreases in case of the disturbances of the Central Synchronizer; – there is a systematic error of GLONASS Time and UTC(SU) transfer accuracy. Taking into consideration the results obtained the authors suggest activities that can increase GLONASS Time and UTC(SU) transfer accuracy. To provide users with high-accuracy determination of position, velocity and time, time scales of GLONASS space vehicles (SV) are referenced to GLONASS Time which is synchronized with coordinated time scale of Russia UTC(SU). Corrections to convert from SV time to GLONASS Time and from GLONASS Time to UTC(SU) are broadcast in GLONASS navigation message. Now GLONASS timing performance parameters, such as GLONASS Time transfer accuracy and UTC(SU) transfer accuracy, meet the requirements of users not completely. To find out the possible reasons, the authors analyzed the monitoring results of UTC(SU) – GLONASS Time offset and GLONASS Time and UTC(SU) transfer to users. The data obtained unveiled several problems in GLONASS Time transfer that require urgent solution. The authors suggest activities that can eliminate the problems mentioned above.

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P. P. Bogdanov, A. V. Druzhin, T. V. Primakina, A. Yu. Feoktistov. Time Transfer Problems in GLONASS // Transactions of IAA RAS. — 2020. — Issue 52. — P. 9–12.

@article{bogdanov2020,
  abstract = {Global Navigation Satellite System GLONASS provides navigation and timing services to different kinds of users. However, now GLONASS timing performance parameters, such as GLONASS Time transfer accuracy and the transfer accuracy of Russian national coordinated time UTC(SU) meet the requirements for the users not completely. The paper is aimed at finding out the possible reasons of insufficient accuracy of time transfer by GLONASS as well as the possible ways of their elimination.
The authors analyzed the principles of time transfer by GLONASS and the monitoring results of GLONASS timing performance parameters. The monitoring was based on measurements at Russian State Time and Frequency Reference that generates UTC(SU) and the data provided by Bureau International et Poids and Mesures (BIPM). The results obtained unveiled the following problems in time transfer by GLONASS:
– the accuracy of GLONASS Time generation decreases in case of the disturbances of the Central Synchronizer;
– there is a systematic error of GLONASS Time and UTC(SU) transfer accuracy.
Taking into consideration the results obtained the authors suggest activities that can increase GLONASS Time and UTC(SU) transfer accuracy.
To provide users with high-accuracy determination of position, velocity and time, time scales of GLONASS space vehicles (SV) are referenced to GLONASS Time which is synchronized with coordinated time scale of Russia UTC(SU). Corrections to convert from SV time to GLONASS Time and from GLONASS Time to UTC(SU) are broadcast in GLONASS navigation message. Now GLONASS timing performance parameters, such as GLONASS Time transfer accuracy and UTC(SU) transfer accuracy, meet the requirements of users not completely. To find out the possible reasons, the authors analyzed the monitoring results of UTC(SU) – GLONASS Time offset and GLONASS Time and UTC(SU) transfer to users. The data obtained unveiled several problems in GLONASS Time transfer that require urgent solution. The authors suggest activities that can eliminate the problems mentioned above.},
  author = {P.~P. Bogdanov and A.~V. Druzhin and T.~V. Primakina and A.~Yu. Feoktistov},
  doi = {10.32876/ApplAstron.52.9-12},
  issue = {52},
  journal = {Transactions of IAA RAS},
  keyword = {Global Navigation Satellite System, GLONASS Time, coordinated time scale of Russia, monitoring, accuracy parameter},
  pages = {9--12},
  title = {Time Transfer Problems in GLONASS},
  url = {http://iaaras.ru/en/library/paper/2026/},
  year = {2020}
}

TY  - JOUR
TI  - Time Transfer Problems in GLONASS
AU  - Bogdanov, P. P.
AU  - Druzhin, A. V.
AU  - Primakina, T. V.
AU  - Feoktistov, A. Yu.
PY  - 2020
T2  - Transactions of IAA RAS
IS  - 52
SP  - 9
AB  - Global Navigation Satellite System GLONASS provides navigation and
timing services to different kinds of users. However, now GLONASS
timing performance parameters, such as GLONASS Time transfer accuracy
and the transfer accuracy of Russian national coordinated time
UTC(SU) meet the requirements for the users not completely. The paper
is aimed at finding out the possible reasons of insufficient accuracy
of time transfer by GLONASS as well as the possible ways of their
elimination.  The authors analyzed the principles of time transfer by
GLONASS and the monitoring results of GLONASS timing performance
parameters. The monitoring was based on measurements at Russian State
Time and Frequency Reference that generates UTC(SU) and the data
provided by Bureau International et Poids and Mesures (BIPM). The
results obtained unveiled the following problems in time transfer by
GLONASS:  – the accuracy of GLONASS Time generation decreases in case
of the disturbances of the Central Synchronizer;  – there is a
systematic error of GLONASS Time and UTC(SU) transfer accuracy.
Taking into consideration the results obtained the authors suggest
activities that can increase GLONASS Time and UTC(SU) transfer
accuracy.  To provide users with high-accuracy determination of
position, velocity and time, time scales of GLONASS space vehicles
(SV) are referenced to GLONASS Time which is synchronized with
coordinated time scale of Russia UTC(SU). Corrections to convert from
SV time to GLONASS Time and from GLONASS Time to UTC(SU) are
broadcast in GLONASS navigation message. Now GLONASS timing
performance parameters, such as GLONASS Time transfer accuracy and
UTC(SU) transfer accuracy, meet the requirements of users not
completely. To find out the possible reasons, the authors analyzed
the monitoring results of UTC(SU) – GLONASS Time offset and GLONASS
Time and UTC(SU) transfer to users. The data obtained unveiled
several problems in GLONASS Time transfer that require urgent
solution. The authors suggest activities that can eliminate the
problems mentioned above.
DO  - 10.32876/ApplAstron.52.9-12
UR  - http://iaaras.ru/en/library/paper/2026/
ER  -