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two measurements is satisfactory, and the RMS of the residual
is 0.165 ns.
Conclusion
In this paper, based on the technology of ODTT of NTSC, a
method for measuring the group delay of an on-orbit satellite
transponder is proposed, and an on-orbit observation experiment
is conducted to evaluate its performance. The results of
data analysis show that the RMS of the residual of the two consecutive
measurements is less than 0.2 ns. Thus, the proposed
method can effectively measure the delay of a satellite transponder
group, and this method is suitable not only for the GEO
satellite but also for IGSO, medium earth orbit and other satellites.
It can not only explore the orbit determination accuracy of
the subsequent optimization system but also provide the satellite
company with a performance evaluation of the satellite
transponder, which can improve the efficiency of the system.
References
[1] J. Liu, Z. Li, X. Yang, J. Ou, S. Zhong, B. Sun, J. Wang, Y. Kong, and
Z. He, " Variation of satellite transponder delay, " Chinese Science
Bulletin, vol. 59, no. 21, pp. 2568-2573, 2014.
[2] J. Lee, M. S. Uhm, I.-B. Yom, S. P. Lee, and C. K. Choi,
" Simultaneous reduction of amplitude and group-delay variation
of input demultiplexer for Ku band satellite transponder, " in Proc.
VTC, pp. 2669-2672, Oct. 2003.
[3] X. Gao, W. Dai, Z. Song, and C. Cai, " Reference satellite selection
method for GNSS high-precision relative positioning, " Geodesy
and Geodynamics, vol. 8, pp. 125-129, 2017.
[4] M. Fujieda, M. Aida, H. Maeno, L. Q. Tung, and J. Amagai,
" Delay difference calibration of TWSTFT earth station using
multichannel modem, " IEEE Trans. Instrum. Meas., vol. 56, no. 2,
pp. 346-350, Apr. 2007.
[5] P. Merck, and J. Achkar, " Design of a ku band delay difference
calibration device for TWSTFT station, " IEEE Trans. Instrum.
Meas., vol. 54, no. 2, pp. 814-818, Apr. 2005.
[6] F. Ye, Y. Yuan, and J. Ou, " Initial orbit determination of BDS-3
satellites based on new code signals, " Geodesy and Geodynamics,
vol. 9, pp. 342-346, 2018.
[7] T. E. Parker, V. Zhang, A. Mckinley, L. Nelson, J. Rohde and D.
Matsakis, " Investigation of instabilities in two-way time transfer, "
in Proc. PTTI, pp. 381-390, Dec. 2002.
[8] T. E. Parker and V. Zhang, " Sources of instabilities in two-way
satellite time transfer, " in Proc. FCSE, pp. 745-751, Aug. 2005.
[9] Z. Li, X. Yang, G. Ai, H. Shi, R. Qiao and C. Feng, " A new method
for determination of satellite orbits by transfer, " Sci. China G,
Phys., Mech. Astron., vol. 52, no. 3, pp. 384-392, 2009.
[10] G. Ai, H. Shi, H. Wu, Y. Yan, Y. Bian, Y. Hu, Z. Li, J. Guo and X. Cai,
" A positioning system based on communication satellites and the
Chinese Area Positioning System (CAPS), " Chinese J. Astronomy
and Astrophysics, vol. 8, no. 6, pp. 611-630, 2008.
[11] F. Cao, X. Yang, M. Su, Z. Li, L. Chen, W. Li, B. Sun, Y. Kong,
P. Wei, and C. Feng, " Evaluation of C-band precise orbit
determination of geostationary earth orbit satellite based on the
Chinese area positioning system, " J. Navigation, vol. 67, no. 2, pp.
343-351, 2014.
96
[12] Y. J. Huang, H. W. Tsao, H. T. Lin, and C. S. Liao, " Multiple access
interference suppression for TWSTFT applications, " IEEE Trans.
Instrum. Meas., vol. 66, no. 6, pp. 1337-1342, Jan. 2017.
[13] W. Wang, X. Yang, S. Ding, W. Li, H. Su, P. Wei, F. Cao, L. Chen,
J. Gong, and Z. Li, " An improved protocol for performing
two-way satellite time and frequency transfer using a satellite
in an inclined geo-synchronous orbit, " IEEE Tran. Ultrasonics,
Ferroelectrics Freq. Control, vol. 65, no. 8, pp. 1475-1486, 2018.
[14] T. T. Thai, I. Sesia, G. D. Rovera, and J. Achkar, " Characterization
of delays for spare SATRE modems in TWSTFT Stations, " in Proc.
EFTF/IFCS, pp. 1-3, Apr. 2019.
Wei Wang (wangwei@ntsc.ac.cn) is currently in the Orbit and
Time Transfer Department, National Time Service Centre, Chinese
Academic of Science, Xi'an, China. He received the B.S.
degree in electronic information engineering from Yan'an University,
Yan'an, Shaanxi, China, in 2013 and the Ph.D. degree in
astrometry and celestial mechanics from University of Chinese
Academic of Sciences, Beijing, China, in 2020. His research interests
include orbit measurement, orbit determination and
time transfer.
Xuhai Yang (yyang@ntsc.ac.cn) is currently the Director of
the Orbit and Time Transfer Department, National Time Service
Centre, Chinese Academic of Science, Xi'an, China. He
received the B.S. degree in applied physics from the Northeastern
University, Shenyang, in 1995 and the Ph.D. degree in
astrometry and celestial mechanics from the Graduate School
of the Chinese Academy of Sciences, Beijing, in 2003. His research
interests include high-precision time transfer, orbit
measurement, and orbit determination.
Weichao Li (liwc@ntsc.ac.cn) currently serves as the Deputy
Director of the Orbit and Time Transfer Department, National
Time Service Centre, Chinese Academic of Science, Xi'an,
China. He received B.S. and M.S. degrees from Northwestern
Polytechnical University, Xi'an, China, in 2002 and 2005,
respectively. He earned the Ph.D. degree from Graduate University
of Chinese Academy of Sciences, Beijing, China, in
2009. His research interests include satellite orbit tracking and
determination, high precise remote time transfer, equipment
calibration of time delay, etc.
Fen Cao (caofen@ntsc.ac.cn) is currently in the Orbit and Time
Transfer Department, National Time Service Centre, Chinese
Academic of Science, Xi'an, China. She received the B.S. degree
in communication engineering from Shandong Normal
University, Jinan, China, in 2008, the M.S. degree in communication
and information systems from University of Chinese
Academic of Sciences, Beijing, China, in 2011 and the Ph.D. degree
in astrometry and celestial mechanics from University of
Chinese Academic of Sciences, Beijing, China, in 2014. Her research
interest is satellite precision orbit determination.
Pei Wei (Weipei@ntsc.ac.cn) is currently in the Orbit and
Time Transfer Department, National Time Service Centre,
IEEE Instrumentation & Measurement Magazine
February 2022
Instrumentation & Measurement Magazine 25-1

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