1 / 26

Improving Signal in Space (SIS) Performance of BDS

Improving Signal in Space (SIS) Performance of BDS Junping Chen, Yize Zhang, Xiuqiang Gong, Yueling Cao, Shanshi Zhou, Sainan Yang, Xiaogong Hu, Bin Wu Shanghai Astronomical Observatory (SHAO) junping@shao.ac.cn http://www.shao.ac.cn/shao_gnss_ac

kevyn
Download Presentation

Improving Signal in Space (SIS) Performance of BDS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Improving Signal in Space (SIS) Performance of BDS Junping Chen, Yize Zhang, Xiuqiang Gong, Yueling Cao, Shanshi Zhou, Sainan Yang, Xiaogong Hu, Bin Wu Shanghai Astronomical Observatory (SHAO) junping@shao.ac.cn http://www.shao.ac.cn/shao_gnss_ac Bo Tang, Li Liu, Rui Guo, Feng He, Xiaoli Wu, Lingfeng Zhu Beijing Satellite Navigation Center

  2. Content • Background & motivation • Challenges in BDS performance improvement • Signal in Space (SIS) performance improvement of BDS • Design of demonstration system • Summary 2

  3. Background & motivation • >30 GPS • >24 GLONASS • 14 BDS • 6 Galileo • 1 QZSS • Interoperability: improve space coverage • Compatibility: frequency compatibility and non-interference David Turner, 2013 3

  4. Background & motivation • SIS performance improvement :GPS Harold Martin, 2014 David Turner, 2013 4

  5. Background & Motivation • SIS performance improvement: GLONASS Sergey Revnivykh，2011 Grigory Stupak,2013 5

  6. Background & Motivation • SIS performance improvement • BDS: constellation & positioning URE Number of visible satellites Yang et al, 2014 6

  7. Challenges in BDS performance improvement • Tracking network • Regionally distributed only IGS MGEX network Chinese regional network 7

  8. Challenges in BDS performance improvement • Data quality • Severe multipath effects 8

  9. Challenges in BDS performance improvement • GEO satellites • IGSO,MEO satellites Orbit overlap 9

  10. BDS SIS performance improvement • Orbits • Solar radiation model, satellite altitude model and arc connection 10

  11. BDS SIS performance improvement • Orbits • Improvement after POD strategy refinement: 20%in average, Maximum 75%; 11

  12. BDS SIS performance improvement • Broadcast clocks • Satellite clock in broadcast is aligned to TS; The clock differences between POD and TS show periodical signals User positioning improvement after broadcast model refinement.3D 22%-59%, 44% in average 12

  13. BDS SIS performance improvement • Ionosphere model • Current model uses 3-order polynomials for amplitude fitting, does not fit to real estimation; tracking network all in north hemisphere 13 13 13 13

  14. BDS SIS performance improvement • Ionosphere model • Modify the function of amplitude; Adding simulated VTECs in south Hemisphere Real estimates GPSK-8 BDS P8 14

  15. BDS SIS performance improvement • Ionosphere Grids • Availability improved by implementing background ION model and introducing GPS data 15

  16. BDS SIS performance improvement • Augmentation system corrections • Orbit corrections; improving SIS in satellite maneuver; Improving PVT performance for regions with few tracking stations. 16

  17. BDS SIS performance improvement • Augmentation system corrections • Pseudo-range based corrections: large noise • Range-phase combined corrections: smooth and small noise 17

  18. BDS SIS performance improvement • Augmentation system corrections • Range-phase combined corrections 18

  19. BDS SIS performance improvement • SISA & Integrity monitoring • SISRE, URA, SISA (GPS,BDS) • SISA is more close to real SIS performance 19

  20. BDS SIS performance improvement • SISA & Integrity monitoring • RAIM: System integrity monitored at tracking stations using Parity method. Detection Identifying 20

  21. BDS SIS performance improvement • SISA & Integrity monitoring • RAIM: System integrity monitored at tracking stations using Parity method. Detection > 2011514 6:00, COCO Identifying 21

  22. Design of demonstration system • Demonstration system SIS performance improvement platform 22 22

  23. Platform • Platform and analysis • http://www.shao.ac.cn/shao_gnss_ac 23

  24. Analysis • Prototype analysis • BDS PPP with cm accuracy • 1.2cmE-W,3.3cmN-S,4.5cmHeight 24

  25. Summary • Challenges in BDS SIS performance improvement • Proposals for BDS SIS performance improvement • We are aiming at improving BDS SIS performance with the goal of decimeter meter UDRE and 1 meter level UERE. • Demonstration system 25

  26. Acknowledgment: 863 projects (No. 2013AA122402,2014AA123102) NSFC project (No. 11273046) http://www.shao.ac.cn/shao_gnss_ac Thank you! 26

More Related