Acta Geodaetica et Cartographica Sinica >

2016 , Vol. 45 >Issue S2: 46 - 53

DOI: https://doi.org/10.11947/j.AGCS.2016.F025

Combination and Assessment of GNSS Clock Products from iGMAS Analysis Centers

  • CHEN Kangkang ,
  • XU Tianhe ,
  • YANG Yuguo ,
  • CAI Hongliang ,
  • CHEN Guo
Expand
  • 1. College of Geology Engineering and Geomatics, Chang'an University, Xi'an 710054, China;
    2. Institute of Geodesy and Photogrammetry, ETH Zurich, Schafmattstr. 34, 8093 Zurich, Switzerland;
    3. Institute of Space Science, Shandong University, Weihai 264209, China;
    4. State Key Laboratory of Geo-information Engineering, Xi'an 710054, China;
    5. Beijing Institute of Tracking and Telecommunication Technology, Beijing, 100094, China;
    6. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China

Received date: 2016-11-25

  Revised date: 2016-12-20

  Online published: 2017-05-20

Supported by

The National Natural Science Foundation of China (No.41574013);The National High-tech Research and Development Program of China (No.2016YFB0501701)

Fold

Abstract

The precise clock corrections are a prerequisite for applications of the GNSS positioning, navigation and timing (PNT) service. Therefore the combination and assessment for clock products is one of the important tasks of product integration and service center (ISC). First of all, it is introduced that the improved strategy and robust estimation of clock combination. The issues including nonlinear systematic error processing, alignment of clock reference and compensation of linear systematic error are highlighted. Furthermore, two combined products using epoch-wise clock alignment and the "three-step" alignment respectively are compared, and the clock products of recent two years from iGMAS are analyzed and evaluated in detail. Finally, in order to verify the accuracy and consistency of the combined products, PPP tests are implemented using static data from 5 IGS stations. The results show that the clock RMS of combined solutions is the best, which can be used as reference to assess the clock quality of analysis centers (ACs). The results of BDS only static PPP using the final combined products is within 4 cm, which is better than that of most ACs.

Key words： iGMAS; multi-GNSS; clock combination; systematic error; Robust estimation

Cite this article

CHEN Kangkang , XU Tianhe , YANG Yuguo , CAI Hongliang , CHEN Guo . Combination and Assessment of GNSS Clock Products from iGMAS Analysis Centers[J]. Acta Geodaetica et Cartographica Sinica, 2016 , 45(S2) : 46 -53 . DOI: 10.11947/j.AGCS.2016.F025

References

[1] DOW J M, NEILAN R E, RIZOS C. The International GNSS Service in a Changing Landscape of Global Navigation Satellite Systems[J]. Journal of Geodesy, 2009, 83(3-4):191-198.
[2] NEILAN R, FISHER S, WALIA G, et al. IGS Central Bureau Technical Report 2015[M]//DACH R, JEAN Y. IGS 2015 Technical Reports. Bureau:IGS Central Bureau, 2016.
[3] STEIGENBERGER P, HUGENTOBLER U, LOYER S, et al. Galileo Orbit and Clock Quality of the IGS Multi-GNSS Experiment[J]. Advances in Space Research, 2015, 55(1):269-281.
[4] HE H, LI J, YANG Y, et al. Performance Assessment of Single-and Dual-frequency BeiDou/GPS Single-epoch Kinematic Positioning[J]. GPS Solutions, 2014(18):393-403. DOI:10.1007/s10291-013-0339-3.
[5] 杨元喜. 卫星导航的不确定性、不确定度与精度若干注记[J]. 测绘学报, 2012, 41(5):646-650. YANG Yuanxi. Some Notes on Uncertainty, Uncertainty Measure and Accuracy in Satellite Navigation[J]. Acta Geodaetica et Cartographica Sinica, 2012, 41(5):646-650.
[6] JIAO W. International GNSS Monitoring and Assessment System (iGMAS) and Latest Progress[C]//China Satellite Navigation Conference (CSNC) 2014. Nanjing:CSNC, 2014.
[7] KOUBA J, MIREAULT Y, LAHAYE F. 1994 IGS Orbit/Clock Combination and Evaluation[R]. Appendix of the Analysis Coordinator Report, International GPS Service for Geodynamics (IGS) 1994 Annual Report, 1995:70-94.
[8] SENIOR K, KOPPANG P, RAY J. Developing an IGS Time Scale[J]. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2003, 50(6):585-593.
[9] SPRINGER T A, ZUMBERGE J F, KOUBA J. The IGS Analysis Products and the Consistency of the Combined Solutions[Z]. Darmstadt:IGS Analysis Center Workshop, 1998.
[10] KOUBA J, SPRINGER T. New IGS Station and Satellite Clock Combination[J]. GPS Solutions, 2001, 4(4):31-36.
[11] FERLAND R, PIRASZEWSKI M. The IGS-combined Station Coordinates, Earth Rotation Parameters and Apparent Geocenter[J]. Journal of Geodesy, 2009, 83(3-4):385-392.
[12] CHEN Kangkang, XU Tianhe, CHEN Guo, et al. The Orbit and Clock Combination of iGMAS Analysis Centers and the Analysis of Their Precision[M]//SUN Jiadong, LIU Jingnan, FAN Shiwei, et al. China Satellite Navigation Conference (CSNC) 2015 Proceedings:Volume Ⅱ. Berlin Heidelberg:Springer, 2015:421-438.
[13] CAI Hongliang, CHEN Kangkang, XU Tianhe, et al. The iGMAS Combined Products and the Analysis of Their Consistency[M]//SUN Jiadong, LIU Jingnan, FAN Shiwei, et al. China Satellite Navigation Conference (CSNC) 2015 Proceedings:Volume Ⅲ. Berlin Heidelberg:Springer, 2015:213-226.
[14] MERVART L, WEBER G. Real-time Combination of GNSS Orbit and Clock Correction Streams Using a Kalman Filter Approach[C]//Proceedings of the 24th International Technical Meeting of the Satellite Division of the Institute of Navigation (ION GNSS 2011). Portland, OR:Oregon Convention Center, 2011:707-711.
[15] 周江文, 黄幼才, 杨元喜,等. 抗差最小二乘法[M]. 武汉:华中理工大学出版社, 1997. ZHOU Jiangwen, HUANG Youcai, YANG Yuanxi, et al. Robust Least Square Method[M]. Wuhan:Huazhong University of Science and Technology, 1997.
[16] CHEN K, XU T, YANG Y. Robust combination of IGS analysis center GLONASS clocks[J]. GPS Solution, 2017. DOI:10.1007/s10291-017-0610-0.
[17] 邱卫宁. 具有稳健初值的选权迭代法[J]. 武汉大学学报(信息科学版), 2003, 28(4):452-454. QIU Weining. Method for Selecting Weight Iteration with Robust Initial Value[J]. Geomatics and Information Science of Wuhan University, 2003, 28(8):452-454.
[18] 欧吉坤. 一种三步抗差方案的设计[J]. 测绘学报, 1996, 25(3):173-179. OU Jikun. Design of A New Scheme of Robust Estimation by Three Steps[J]. Acta Geodaetica et Cartographica Sinica, 1996, 25(3):173-179.
[19] 赵丽华, 杨元喜, 王庆良. 考虑区域构造特征的地壳形变分析拟合推估模型[J]. 测绘学报, 2011, 40(4):435-441. ZHAO Lihua, YANG Yuanxi, WANG Qingliang. Collocation Model Based on Regional Tectonic Features in Crustal Deformation Analysis[J]. Acta Geodaetica et Cartographica Sinica, 2011, 40(4):435-441.
[20] KOUBA J, HÉROUX P. Precise Point Positioning Using IGS Orbit and Clock Products[J]. GPS Solutions, 2001, 5(2):12-28.
Options
Outlines

/

〈 〉