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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) [email protected] http://www.shao.ac.cn/shao_gnss_ac

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Presentation Transcript
slide1

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)

[email protected]

http://www.shao.ac.cn/shao_gnss_ac

Bo Tang, Li Liu, Rui Guo, Feng He, Xiaoli Wu, Lingfeng Zhu

Beijing Satellite Navigation Center

slide2

Content

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

2

slide3

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

slide4

Background & motivation

  • SIS performance improvement :GPS

Harold Martin, 2014

David Turner, 2013

4

slide5

Background & Motivation

  • SIS performance improvement: GLONASS

Sergey Revnivykh,2011

Grigory Stupak,2013

5

slide6

Background & Motivation

  • SIS performance improvement
  • BDS: constellation & positioning

URE

Number of visible

satellites

Yang et al, 2014

6

slide7

Challenges in BDS performance improvement

  • Tracking network
  • Regionally distributed only

IGS MGEX network

Chinese regional network

7

slide8

Challenges in BDS performance improvement

  • Data quality
  • Severe multipath effects

8

slide9

Challenges in BDS performance improvement

  • GEO satellites
  • IGSO,MEO satellites

Orbit overlap

9

slide10

BDS SIS performance improvement

  • Orbits
  • Solar radiation model, satellite altitude model and arc connection

10

slide11

BDS SIS performance improvement

  • Orbits
  • Improvement after POD strategy refinement: 20%in average, Maximum 75%;

11

slide12

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

slide13

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

slide14

BDS SIS performance improvement

  • Ionosphere model
  • Modify the function of amplitude; Adding simulated VTECs in south Hemisphere

Real estimates

GPSK-8

BDS P8

14

slide15

BDS SIS performance improvement

  • Ionosphere Grids
  • Availability improved by implementing background ION model and introducing GPS data

15

slide16

BDS SIS performance improvement

  • Augmentation system corrections
  • Orbit corrections; improving SIS in satellite maneuver;

Improving PVT performance for regions with few tracking stations.

16

slide17

BDS SIS performance improvement

  • Augmentation system corrections
  • Pseudo-range based corrections: large noise
  • Range-phase combined corrections: smooth and small noise

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slide18

BDS SIS performance improvement

  • Augmentation system corrections
  • Range-phase combined corrections

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slide19

BDS SIS performance improvement

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

19

slide20

BDS SIS performance improvement

  • SISA & Integrity monitoring
  • RAIM: System integrity monitored at tracking stations using Parity method.

Detection

Identifying

20

slide21

BDS SIS performance improvement

  • SISA & Integrity monitoring
  • RAIM: System integrity monitored at tracking stations using Parity method.

Detection

>

2011514 6:00, COCO

Identifying

21

slide22

Design of demonstration system

  • Demonstration system

SIS performance improvement platform

22

22

slide23

Platform

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

23

slide24

Analysis

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

24

slide25

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

slide26

Acknowledgment: 863 projects

(No. 2013AA122402,2014AA123102)

NSFC project (No. 11273046)

http://www.shao.ac.cn/shao_gnss_ac

Thank you!

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