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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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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


Content

  • Background & motivation

  • Challenges in BDS performance improvement

  • Signal in Space (SIS) performance improvement of BDS

  • Design of demonstration system

  • Summary

2


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


    Background & motivation

    • SIS performance improvement :GPS

    Harold Martin, 2014

    David Turner, 2013

    4


    Background & Motivation

    • SIS performance improvement: GLONASS

    Sergey Revnivykh,2011

    Grigory Stupak,2013

    5


    Background & Motivation

    • SIS performance improvement

    • BDS: constellation & positioning

    URE

    Number of visible

    satellites

    Yang et al, 2014

    6


    Challenges in BDS performance improvement

    • Tracking network

    • Regionally distributed only

    IGS MGEX network

    Chinese regional network

    7


    Challenges in BDS performance improvement

    • Data quality

    • Severe multipath effects

    8


    Challenges in BDS performance improvement

    • GEO satellites

    • IGSO,MEO satellites

    Orbit overlap

    9


    BDS SIS performance improvement

    • Orbits

    • Solar radiation model, satellite altitude model and arc connection

    10


    BDS SIS performance improvement

    • Orbits

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

    11


    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


    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


    BDS SIS performance improvement

    • Ionosphere model

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

    Real estimates

    GPSK-8

    BDS P8

    14


    BDS SIS performance improvement

    • Ionosphere Grids

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

    15


    BDS SIS performance improvement

    • Augmentation system corrections

    • Orbit corrections; improving SIS in satellite maneuver;

    Improving PVT performance for regions with few tracking stations.

    16


    BDS SIS performance improvement

    • Augmentation system corrections

    • Pseudo-range based corrections: large noise

    • Range-phase combined corrections: smooth and small noise

    17


    BDS SIS performance improvement

    • Augmentation system corrections

    • Range-phase combined corrections

    18


    BDS SIS performance improvement

    • SISA & Integrity monitoring

    • SISRE, URA, SISA (GPS,BDS)

    • SISA is more close to real SIS performance

    19


    BDS SIS performance improvement

    • SISA & Integrity monitoring

    • RAIM: System integrity monitored at tracking stations using Parity method.

    Detection

    Identifying

    20


    BDS SIS performance improvement

    • SISA & Integrity monitoring

    • RAIM: System integrity monitored at tracking stations using Parity method.

    Detection

    >

    2011514 6:00, COCO

    Identifying

    21


    Design of demonstration system

    • Demonstration system

    SIS performance improvement platform

    22

    22


    Platform

    • Platform and analysis

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

    23


    Analysis

    • Prototype analysis

      • BDS PPP with cm accuracy

      • 1.2cmE-W,3.3cmN-S,4.5cmHeight

    24


    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


    Acknowledgment: 863 projects

    (No. 2013AA122402,2014AA123102)

    NSFC project (No. 11273046)

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

    Thank you!

    26


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